COLREG 72 Downloads & RevenueCOLREG 72: Rules of the Road · App Store & Google Play
COLREG 72: Rules of the Road by Smirnov Yury is on App Store and Google Play. Active Users (MAU & DAU), Downloads, rankings, keywords, revenue, and rating totals.
COLREG 72: Rules of the Road update history & changes
Last change · 104 events since 30 Jun 2015Full timeline ↓✏️iOSDescription updated✏️iOSNew iPad screenshots📣iOSDropped 200 ad networks🚀iOSNow shown next to ColRegs: Rules of the Road, Marinus: maritime rules, Sail Safe +4 more📈iOSEntered the top 10📦iOSUpdated to version 2.9.0📦iOSUpdated to version 2.8.4🆕AndroidFirst spotted by AppInsider📦AndroidVersion 2.8.2📈iOSEntered the top 10🆕iOSFirst spotted by AppInsider🆕AndroidReleased on Google Play🆕iOSReleased on the App Store
Full timeline · 104 events
- ✏️COLREG 72: Rules of the Road: description updatediOS· 4 countries
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· 4 countries
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · 4 countries
- 📣COLREG 72: Rules of the Road dropped 200 ad networksiOS33across.com, 9dotsmedia.com, acd.op.hicloud.com, aceex.io, acexchange.co.kr, adagio.io, adbility-media.com, adbro.me, adcolony.com, adelement.com, adform.com, adiiix.com, adingenious.com, adingo.jp, adipolo.com, adipolosolutions.com, admanmedia.com, admatic.com.tr, admatic.de, admixer.co.kr, admixe (the developer's app-ads.txt)
- 🚀COLREG 72: Rules of the Road: now shown next to ColRegs: Rules of the Road, Marinus: maritime rules, Sail Safe +4 moreiOSthe store's “similar apps” for it changed: who it's seen as competing with
- 📈COLREG 72: Rules of the Road entered the top 10iOSTop Paid · Education · IT
- ✏️COLREG 72: Rules of the Road: description updatediOS· RU
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· RU
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · RU
- ✏️COLREG 72: Rules of the Road: description updatediOS· ID
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· ID
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · ID, CA, AU
- ✏️COLREG 72: Rules of the Road: description updatediOS· FR
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· FR
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · FR
- ✏️COLREG 72: Rules of the Road: description updatediOS· CA
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· CA
- ✏️COLREG 72: Rules of the Road: description updatediOS· AU
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· AU
- 📦COLREG 72: Rules of the Road updated to version 2.9.0iOSReport an error
Spotted a mistake in a question? Send it straight from the card, with an optional comment and email.
Theory
A button at the end of each section opens the next one.
Lights: yellow flashing lights now flash at 120 per minute (Rule 21(f)), purse seiner lights alternate, and some light cards now explain what the vessel is showing. Text and translation fixes.… more - ✏️COLREG 72: Rules of the Road: description updatediOS· IT
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· IT
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · IT
- 📦COLREG 72: Rules of the Road updated to version 2.8.4iOSFixed the two-colour sidelight on vessels seen from ahead: green is now on the left, red on the right. Thanks to the user who reported it.
- ✏️COLREG 72: Rules of the Road: description updatediOS· SE
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· SE
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · SE
- ✏️COLREG 72: Rules of the Road: description updatediOS· ZA
- ✏️COLREG 72: Rules of the Road: renamediOSCOLREG 72: safety at sea → COLREG 72: Rules of the Road · ZA
- 🆕COLREG 72: Rules of the Road first spotted by AppInsiderAndroidUnited States (found via similar)
- ✏️COLREG 72: Rules of the Road: description updatediOS· ES
- ✏️COLREG 72: Rules of the Road: renamediOSRIPA 72: Seguridad en el mar → RIPA 72: Luces y examen PER · ES
- ✏️COLREG 72: Rules of the Road: description updatediOS· ID
- ✏️COLREG 72: Rules of the Road: description updatediOS· TR
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· TR
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · TR
- ✏️COLREG 72: Rules of the Road: renamediOSCOLREG 72: safety at sea → COLREG 72: Rules of the Road · TR
- ✏️COLREG 72: Rules of the Road: description updatediOS· NL
- ✏️COLREG 72: Rules of the Road: description updatediOS· US
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· US
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · US
- ✏️COLREG 72: Rules of the Road: renamediOSCOLREG 72: safety at sea → COLREG 72: Rules of the Road · US
- ✏️COLREG 72: Rules of the Road: description updatediOS· DE
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· DE
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · DE
- ✏️COLREG 72: Rules of the Road: renamediOSCOLREG 72: Rules of the Road → KVR: Lichterführung & SBF See · DE
- ✏️COLREG 72: Rules of the Road: description updatediOS· GB
- ✏️COLREG 72: Rules of the Road added 1 languageiOS+ DE
- ✏️COLREG 72: Rules of the Road: description updatediOS· RU
- ✏️COLREG 72: Rules of the Road: description updatediOS· FR
- ✏️COLREG 72: Rules of the Road: description updatediOS· CA
- ✏️COLREG 72: Rules of the Road: description updatediOS· AU
- 📦COLREG 72: Rules of the Road updated to version 2.8.2iOSGerman
The app is now fully available in German: interface, rule texts, theory and all questions.
Back to tests
When you finish a test, the completion dialog now offers Back to tests instead of Cancel.
Place the Lights: corrected vessel silhouettes and light positions, clearer wording in several questions (optional lights, pushing vessels, towed objects, anchor lights). Text fixes in light questions, rule texts and translations.… more - 📦COLREG 72: Rules of the Road: now updating weeklyiOS4 updates in 30 days, after a quiet two months
- ✏️COLREG 72: Rules of the Road: description updatediOS· NL
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· NL
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · NL
- 📦COLREG 72: Rules of the Road version 2.8.2AndroidNew question type: place the navigation lights on the vessel silhouette yourself. 74 light placement quizzes across Rules 23–30, with hints, a light-by-light review and a direct link to the rule.
Now in German too: interface, rule texts, theory and all questions.
Also new: on tablets the picture now sits next to the answers, so you no longer scroll to reach the options.
Also: Back to tests after a test; corrected silhouettes, light positions and wording in placement quizzes.… more - ✏️COLREG 72: Rules of the Road: renamediOSCOLREG 72: safety at sea → COLREG 72: Rules of the Road · 4 countries
- ✏️COLREG 72: Rules of the Road: description updatediOS· DE
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· DE
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · DE
- ✏️COLREG 72: Rules of the Road: renamediOSRIPAM: sécurité en mer → RIPAM: permis bateau côtier · FR
- 📦COLREG 72: Rules of the Road updated to version 2.8.1iOSQuiz questions, redesigned for tablets
On iPad and other tablets the picture now sits next to the answers, so you no longer scroll to reach the options. Place the Lights uses the same layout, with the light palette right under the vessel.… more - ✏️COLREG 72: Rules of the Road: description updatediOS· ZA
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· ZA
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · ZA
- ✏️COLREG 72: Rules of the Road: description updatediOS· ID
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· ID, AU
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · ID, AU
- ✏️COLREG 72: Rules of the Road: description updatediOS· AU
- ✏️COLREG 72: Rules of the Road: description updatediOS· FR
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· FR
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · FR
- ✏️COLREG 72: Rules of the Road: description updatediOS· RU
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· RU
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · RU
- ✏️COLREG 72: Rules of the Road: description updatediOS· GB
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· GB, CA
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · GB, CA
- ✏️COLREG 72: Rules of the Road: description updatediOS· CA
- 📦COLREG 72: Rules of the Road updated to version 2.8.0iOSLight Placement Quizzes
A new question type: put the navigation lights on the vessel silhouette yourself — masthead, side and stern lights, special signals. 74 questions across Rules 23–30, with hints, a light-by-light review and a direct link to the rule.
Learn Annex I the practical way: where each light goes, not just what it means.… more - ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· RU
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · RU
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · SE, ID, DE
- ✏️COLREG 72: Rules of the Road: renamediOSCOLREG 72: safety at sea → COLREG 72: Rules of the Road · SE, DE
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· ID, DE
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · IT
- ✏️COLREG 72: Rules of the Road: renamediOSCOLREG 72: safety at sea → COLREG 72: Rules of the Road · IT
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· GB, CA, AU
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · GB, CA, AU
- ✏️COLREG 72: Rules of the Road: new iPad screenshotsiOS· FR
- ✏️COLREG 72: Rules of the Road: new screenshotsiOS10 screenshots (was 10) · FR
- ✏️COLREG 72: Rules of the Road: app got smalleriOS108 MB → 74 MB (-31%)
- 📦COLREG 72: Rules of the Road: first update in 159 daysiOS
- 📦COLREG 72: Rules of the Road updated to version 2.7.1iOSMaintenance Update
Updated internal libraries for better compatibility with the latest iOS versions and improved overall stability. Minor fixes and performance improvements. - 📈COLREG 72: Rules of the Road entered the top 10iOSTop Paid · Education · FR
- 📈COLREG 72: Rules of the Road entered the top 10 in 2 chartsiOSTop Paid · Education · ID · Top Paid · Education · RU
- 📈COLREG 72: Rules of the Road entered the top 10iOSTop Paid · Education · AU
- 📈COLREG 72: Rules of the Road entered the top 10iOSTop Paid · Education · CA
- 🆕COLREG 72: Rules of the Road first spotted by AppInsideriOS#95 in Top Paid · Education · Australia
- 📦COLREG 72: Rules of the Road version 2.7.0iOSSmart Study Reminders
Turn on optional reminders and Vessel Lights will bring you back only when there is something useful to practise: an unfinished exam, personal practice, or mistakes to review.
Respectful Timing
Reminders use quiet hours and weekly caps, so notifications stay focused and easy to control.
Reliability Fixes
Improved background sync for reminder profiles and fixed a rare secure-storage crash during start-up.… more - 🆕COLREG 72: Rules of the Road released on Google PlayAndroid
- 🆕COLREG 72: Rules of the Road released on the App StoreiOS
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
4.8 ★
3.5k ratings, both stores
Measured
Best rank now
#9
App Store · 
Education Paid
Education PaidMeasured
New ratings a week
2.9
▲ +75% vs the 2 weeks before
Measured
COLREG 72: Rules of the Road at a glance
AI summary written from our chart and store data, 2026-11-06. It can be wrong: check the numbers above.
A paid educational reference and exam preparation tool for maritime students and professionals, offering the full text of COLREGs rules alongside interactive quizzes, theory links, and timed mock exams. The app holds a strong #4 position in the French Education Paid charts, indicating significant regional traction, while maintaining moderate visibility in other major English-speaking markets like Canada and the US.
Similar apps: Marine Navigation, Navionics, IMO Model Course
App Store
App details
App ID
1010178487
Publisher
Smirnov Yury
Publisher country
Netherlands
On the store since
Jun 2015
11 years on the store
Minimum OS
iOS 15.0+
iPhone 6s and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
5
EN FR DE RU ES
Size
82 MB
Also listed in
Navigation
Google Play
App details
App ID
edu.SmirnovYury.EngVesselLights
Publisher
Mikhail Smirnov
Publisher country
Netherlands
Content rating
Everyone
COLREG 72: Rules of the Road downloads & installs
Both stores, worldwide. Bands are open; exact numbers are free with an account.
| Store | Downloads / day | Lifetime installs |
|---|---|---|
| App Store | – | 10k+ |
| Google Play | – | 100k+ Measured |
| Total | – | 100k+ Confidence |
How this is calculated
App Store: chart positions and rating growth per country, anchored on its own Android downloads; lifetime from ratings worldwide × installs per rating. Google Play: the daily change in its exact install count. The total adds every store.
Where COLREG 72: Rules of the Road's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend before Apple and Google take their fee.
| Store | Per day | Per month | Share |
|---|---|---|---|
| App Store | |||
| Google Play | |||
| Total | Confidence | 100% |
Business model: Ad-led
How COLREG 72: Rules of the Road makes money: subscriptions, one-off purchases and ads.
In-app purchasesAds · 3 ad networks
One-off purchases
/mo
of revenue
Ads
/mo
of revenue
Where it ranks now
Both stores, across every country we track.
| Store | Best rank | Charting in | US Top Free | US Top Grossing |
|---|---|---|---|---|
| App Store | #9 Education Paid | 9 of 30 countries | – | – |
| Google Play | – | 0 of 23 countries | – | – |
Full chart lists: App Store · Google Play.
Review momentum
ⓘ How we measure thisNew ratings a week
2.9
▲ +75% vs the 2 weeks before
Lifetime rating
4.8★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
76/100
faster than 76% of Education apps
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
Ratings
Both stores. Store data, measured.
| Store | Rating | Ratings |
|---|---|---|
| App Store | 4.9 ★ | 123 |
| Google Play | 4.8 ★ | 3.4k 15 written reviews |
| Both stores | 4.8 ★ weighted by ratings | 3.5k |
What users say about COLREG 72: Rules of the Road
From recent reviews.
About COLREG 72: Rules of the Road
COLREG 72 is a study and reference app for the Rules of the Road: the International Regulations for Preventing Collisions at Sea (COLREGs) and, for US users, the US Inland Navigation Rules (33 CFR 83) with USCG exam prep. Built for captain's license candidates, maritime students, merchant mariners, yacht captains and boaters.
US NAVIGATION RULES
Shown when the device region is United States and English is the app language:
- International and Inland rules side by side, with INTL / INLAND tags on the questions
- Full text of the Inland Navigation Rules (33 CFR 83, Subparts A–E), the Pilot Rules (Annex V) and the demarcation lines (§ 80.01)
- Inland questions: lights, Rule 34 sound signals, meeting, crossing and overtaking situations, definitions and application
- Play the horn signal in sound-signal questions and answer by ear
- Practice exam International + Inland: 50 questions, 45 to pass, 50 minutes. Or take International or Inland only
- Four sample examinations based on public USCG / NMC samples (Q100, Q300, Q301, Q450), 50 questions each, for Rules of the Road exam prep
WHAT IS INCLUDED
- Full text of all COLREG rules (Annexes I through IV)
- Theory study with illustrations
- Navigation lights identification quizzes
- Light placement quizzes — put the lights on the vessel silhouette yourself (Rules 23–30)
- Rule-based tests with answer explanations
- Exam mode — a timed practice exam with a final score and a full mistake review
- Cross-references between rules and theory — open in popup overlays so you never lose your place
HOW IT WORKS
Theory and rules are linked throughout the app. When you answer a quiz question incorrectly or open a hint, a direct link appears to the exact rule that covers the topic. Review the rule, then return to the quiz.
The app tracks which theory sections you have read, so you always know where you left off and what still needs attention.
EXAM MODE
Practice under exam-like conditions. The exam is timed and draws questions from across the rules. When time runs out, you get a result screen with your score and every mistake listed. Tap a wrong answer to see the explanation and a direct link to the relevant rule, so every attempt teaches you something.
READING
Choose from multiple fonts, adjust the font size, and switch between light, sepia and dark themes for comfortable study in any lighting. Layouts are tuned for both iPhone and iPad.
WHO IT IS FOR
- USCG captain's license candidates (OUPV / six-pack, Master) studying the Rules of the Road
- US boaters who navigate on inland waters
- Maritime students at nautical colleges and academies
- Merchant mariners and deck officers refreshing collision avoidance rules
- Yacht skippers, sailors and anyone preparing for a maritime exam
One-time purchase. No subscription. No ads. Study offline, anytime.
Download COLREG 72 and arrive at your exam prepared.
COLREG 72 is an independent study app. It is not affiliated with or endorsed by the IMO, the U.S. Coast Gua
US NAVIGATION RULES
Shown when the device region is United States and English is the app language:
- International and Inland rules side by side, with INTL / INLAND tags on the questions
- Full text of the Inland Navigation Rules (33 CFR 83, Subparts A–E), the Pilot Rules (Annex V) and the demarcation lines (§ 80.01)
- Inland questions: lights, Rule 34 sound signals, meeting, crossing and overtaking situations, definitions and application
- Play the horn signal in sound-signal questions and answer by ear
- Practice exam International + Inland: 50 questions, 45 to pass, 50 minutes. Or take International or Inland only
- Four sample examinations based on public USCG / NMC samples (Q100, Q300, Q301, Q450), 50 questions each, for Rules of the Road exam prep
WHAT IS INCLUDED
- Full text of all COLREG rules (Annexes I through IV)
- Theory study with illustrations
- Navigation lights identification quizzes
- Light placement quizzes — put the lights on the vessel silhouette yourself (Rules 23–30)
- Rule-based tests with answer explanations
- Exam mode — a timed practice exam with a final score and a full mistake review
- Cross-references between rules and theory — open in popup overlays so you never lose your place
HOW IT WORKS
Theory and rules are linked throughout the app. When you answer a quiz question incorrectly or open a hint, a direct link appears to the exact rule that covers the topic. Review the rule, then return to the quiz.
The app tracks which theory sections you have read, so you always know where you left off and what still needs attention.
EXAM MODE
Practice under exam-like conditions. The exam is timed and draws questions from across the rules. When time runs out, you get a result screen with your score and every mistake listed. Tap a wrong answer to see the explanation and a direct link to the relevant rule, so every attempt teaches you something.
READING
Choose from multiple fonts, adjust the font size, and switch between light, sepia and dark themes for comfortable study in any lighting. Layouts are tuned for both iPhone and iPad.
WHO IT IS FOR
- USCG captain's license candidates (OUPV / six-pack, Master) studying the Rules of the Road
- US boaters who navigate on inland waters
- Maritime students at nautical colleges and academies
- Merchant mariners and deck officers refreshing collision avoidance rules
- Yacht skippers, sailors and anyone preparing for a maritime exam
One-time purchase. No subscription. No ads. Study offline, anytime.
Download COLREG 72 and arrive at your exam prepared.
COLREG 72 is an independent study app. It is not affiliated with or endorsed by the IMO, the U.S. Coast Gua
COLREG 72: Rules of the Road App Store
COLREG 72: Rules of the Road is #9 in Education Paid in Italy and charting in 9 of 30 countries we track.
Updated 9 Nov 2026 · rankings refresh through the day
DeveloperSmirnov Yury
CategoryEducation
Price3.99 USD
Released
Rating★ 4.9 (123)
Version2.9.0
Age rating4+
First seen by us
24 Sep 2026
24 Sep 2026Installs (est.)10k+ worldwide
Rating
4.9 ★
123 ratings
Measured
Best rank now
#9
Education PaidMeasured
New ratings a week
2.9
▲ +75% vs the 2 weeks before
Measured
COLREG 72: Rules of the Road at a glance
AI summary written from our chart and store data, 2026-11-06. It can be wrong: check the numbers above.
A paid educational reference and exam preparation tool for maritime students and professionals, offering the full text of COLREGs rules alongside interactive quizzes, theory links, and timed mock exams. The app holds a strong #4 position in the French Education Paid charts, indicating significant regional traction, while maintaining moderate visibility in other major English-speaking markets like Canada and the US.
Similar apps: Marine Navigation, Navionics, IMO Model Course
COLREG 72: Rules of the Road on the App Store
App details
App ID
1010178487
Publisher
Smirnov Yury
Publisher country
Netherlands
On the store since
Jun 2015
11 years on the store
Minimum OS
iOS 15.0+
iPhone 6s and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
5
EN FR DE RU ES
Size
82 MB
Also listed in
Navigation
COLREG 72: Rules of the Road downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. App Store downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Where COLREG 72: Rules of the Road's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend in COLREG 72: Rules of the Road before Apple and Google take their fee.
How this is calculated
Not on any Top Grossing chart: monthly active users × spend per user for its category, measured on the charted apps nearest the bottom of the charts.
Business model: Ad-led
How COLREG 72: Rules of the Road makes money: subscriptions, one-off purchases and ads.
In-app purchasesAds · 3 ad networks
One-off purchases
/mo
of revenue
Ads
/mo
of revenue
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Italy | EducationPaid | #9 |
 United States | EducationPaid | #74 |
 United Kingdom | EducationPaid | #53 |
 France | EducationPaid | #54 |
 Canada | EducationPaid | #51 |
| Australia | EducationPaid | #149 |
 Russia | EducationPaid | #137 |
 South Africa | All AppsPaid | #80 |
 Indonesia | EducationPaid | #197 |
Apps near COLREG 72: Rules of the Road on the chart
Education Paid, around #9.
Ratings
App Store, worldwide.
Rating
4.9 ★
123 ratings
Measured
Ratings
123
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
2.9
▲ +75% vs the 2 weeks before
Lifetime rating
4.8★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
76/100
faster than 76% of Education apps
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
What users say about COLREG 72: Rules of the Road
From recent reviews.
About COLREG 72: Rules of the Road
COLREG 72 is a study and reference app for the Rules of the Road: the International Regulations for Preventing Collisions at Sea (COLREGs) and, for US users, the US Inland Navigation Rules (33 CFR 83) with USCG exam prep. Built for captain's license candidates, maritime students, merchant mariners, yacht captains and boaters.
US NAVIGATION RULES
Shown when the device region is United States and English is the app language:
- International and Inland rules side by side, with INTL / INLAND tags on the questions
- Full text of the Inland Navigation Rules (33 CFR 83, Subparts A–E), the Pilot Rules (Annex V) and the demarcation lines (§ 80.01)
- Inland questions: lights, Rule 34 sound signals, meeting, crossing and overtaking situations, definitions and application
- Play the horn signal in sound-signal questions and answer by ear
- Practice exam International + Inland: 50 questions, 45 to pass, 50 minutes. Or take International or Inland only
- Four sample examinations based on public USCG / NMC samples (Q100, Q300, Q301, Q450), 50 questions each, for Rules of the Road exam prep
WHAT IS INCLUDED
- Full text of all COLREG rules (Annexes I through IV)
- Theory study with illustrations
- Navigation lights identification quizzes
- Light placement quizzes — put the lights on the vessel silhouette yourself (Rules 23–30)
- Rule-based tests with answer explanations
- Exam mode — a timed practice exam with a final score and a full mistake review
- Cross-references between rules and theory — open in popup overlays so you never lose your place
HOW IT WORKS
Theory and rules are linked throughout the app. When you answer a quiz question incorrectly or open a hint, a direct link appears to the exact rule that covers the topic. Review the rule, then return to the quiz.
The app tracks which theory sections you have read, so you always know where you left off and what still needs attention.
EXAM MODE
Practice under exam-like conditions. The exam is timed and draws questions from across the rules. When time runs out, you get a result screen with your score and every mistake listed. Tap a wrong answer to see the explanation and a direct link to the relevant rule, so every attempt teaches you something.
READING
Choose from multiple fonts, adjust the font size, and switch between light, sepia and dark themes for comfortable study in any lighting. Layouts are tuned for both iPhone and iPad.
WHO IT IS FOR
- USCG captain's license candidates (OUPV / six-pack, Master) studying the Rules of the Road
- US boaters who navigate on inland waters
- Maritime students at nautical colleges and academies
- Merchant mariners and deck officers refreshing collision avoidance rules
- Yacht skippers, sailors and anyone preparing for a maritime exam
One-time purchase. No subscription. No ads. Study offline, anytime.
Download COLREG 72 and arrive at your exam prepared.
COLREG 72 is an independent study app. It is not affiliated with or endorsed by the IMO, the U.S. Coast Gua
US NAVIGATION RULES
Shown when the device region is United States and English is the app language:
- International and Inland rules side by side, with INTL / INLAND tags on the questions
- Full text of the Inland Navigation Rules (33 CFR 83, Subparts A–E), the Pilot Rules (Annex V) and the demarcation lines (§ 80.01)
- Inland questions: lights, Rule 34 sound signals, meeting, crossing and overtaking situations, definitions and application
- Play the horn signal in sound-signal questions and answer by ear
- Practice exam International + Inland: 50 questions, 45 to pass, 50 minutes. Or take International or Inland only
- Four sample examinations based on public USCG / NMC samples (Q100, Q300, Q301, Q450), 50 questions each, for Rules of the Road exam prep
WHAT IS INCLUDED
- Full text of all COLREG rules (Annexes I through IV)
- Theory study with illustrations
- Navigation lights identification quizzes
- Light placement quizzes — put the lights on the vessel silhouette yourself (Rules 23–30)
- Rule-based tests with answer explanations
- Exam mode — a timed practice exam with a final score and a full mistake review
- Cross-references between rules and theory — open in popup overlays so you never lose your place
HOW IT WORKS
Theory and rules are linked throughout the app. When you answer a quiz question incorrectly or open a hint, a direct link appears to the exact rule that covers the topic. Review the rule, then return to the quiz.
The app tracks which theory sections you have read, so you always know where you left off and what still needs attention.
EXAM MODE
Practice under exam-like conditions. The exam is timed and draws questions from across the rules. When time runs out, you get a result screen with your score and every mistake listed. Tap a wrong answer to see the explanation and a direct link to the relevant rule, so every attempt teaches you something.
READING
Choose from multiple fonts, adjust the font size, and switch between light, sepia and dark themes for comfortable study in any lighting. Layouts are tuned for both iPhone and iPad.
WHO IT IS FOR
- USCG captain's license candidates (OUPV / six-pack, Master) studying the Rules of the Road
- US boaters who navigate on inland waters
- Maritime students at nautical colleges and academies
- Merchant mariners and deck officers refreshing collision avoidance rules
- Yacht skippers, sailors and anyone preparing for a maritime exam
One-time purchase. No subscription. No ads. Study offline, anytime.
Download COLREG 72 and arrive at your exam prepared.
COLREG 72 is an independent study app. It is not affiliated with or endorsed by the IMO, the U.S. Coast Gua
Latest updates
2.9.0
Report an error
Spotted a mistake in a question? Send it straight from the card, with an optional comment and email.
Theory
A button at the end of each section opens the next one.
Lights: yellow flashing lights now flash at 120 per minute (Rule 21(f)), purse seiner lights alternate, and some light cards now explain what the vessel is showing. Text and translation fixes.
2.8.4
Fixed the two-colour sidelight on vessels seen from ahead: green is now on the left, red on the right. Thanks to the user who reported it.
2.8.2
German
The app is now fully available in German: interface, rule texts, theory and all questions.
Back to tests
When you finish a test, the completion dialog now offers Back to tests instead of Cancel.
Place the Lights: corrected vessel silhouettes and light positions, clearer wording in several questions (optional lights, pushing vessels, towed objects, anchor lights). Text fixes in light questions, rule texts and translations.
Store changes
What COLREG 72: Rules of the Road changed on its store page: name, icon, screenshots, price, size, languages, requirements.
Description updated
New iPad screenshots
New screenshots
10 screenshots (was 10)
More from Smirnov Yury
COLREG 72: Rules of the Road Android
Not in a tracked Google Play top chart right now.
Updated 9 Nov 2026 · rankings refresh through the day
DeveloperHappy Jigsaw
CategoryEducation
PriceFree
Released
Installs100k+
Rating★ 4.8 (3.4k)
Updated
Content ratingEveryone
Rating
4.8 ★
3.4k ratings
Measured
COLREG 72: Rules of the Road on Google Play
App details
App ID
edu.SmirnovYury.EngVesselLights
Publisher
Mikhail Smirnov
Publisher country
Netherlands
Content rating
Everyone
COLREG 72: Rules of the Road downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Google Play shows an exact lifetime install count; downloads per day are its daily change (measured). When Play hasn't refreshed the count, they come from new ratings and Top Free chart positions. Confidence is the chance the real number is within half to double ours.
Where COLREG 72: Rules of the Road's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend in COLREG 72: Rules of the Road before Apple and Google take their fee.
How this is calculated
Not on any Top Grossing chart: monthly active users × spend per user for its category, measured on the charted apps nearest the bottom of the charts.
Business model: Ad-led
How COLREG 72: Rules of the Road makes money: subscriptions, one-off purchases and ads.
In-app purchasesAds · 3 ad networks
One-off purchases
/mo
of revenue
Ads
/mo
of revenue
Where it ranks on Google Play
Every top 200 chart it appears in across 23 countries.
| Country | Charts | Rank |
|---|---|---|
| Not in a Google Play top chart right now. | ||
Ratings
Google Play, worldwide.
Rating
4.8 ★
3.4k ratings
Measured
Ratings
3.4k
Measured
Written reviews
15
Measured
About COLREG 72: Rules of the Road
COLREG 72 is a complete study and reference app for the International Regulations for Preventing Collisions at Sea, better known as the Rules of the Road. Learn navigation lights, day shapes and sound signals, then test yourself with quizzes. Built for maritime students, merchant navy officers, yacht captains, recreational boaters, and anyone preparing for a captain's license, boating license or maritime exam.
WHAT IS INCLUDED
- Flashcard System — Card-based learning tied directly to COLREG 72 paragraphs. Review each rule at your own pace and track which cards you've mastered.
- Interactive Quizzes — Test your knowledge with multiple-choice quizzes. Instant feedback, answer statistics, and progress tracking help you focus on weak areas.
- Light Placement Quizzes — Put the navigation lights on the vessel silhouette yourself: masthead, side and stern lights, special signals. 74 hands-on questions across Rules 23–30 with hints and a light-by-light review. The fastest way to remember the nav lights of power-driven vessels, sailing vessels, tugs, trawlers, pilot boats and ships at anchor.
- Theory with Explanations — Full COLREG 72 theory content broken into digestible sections. Detailed explanations make complex navigation rules easy to understand.
- Sound Signals — Audio playback for all mandatory sound signals. Learn to recognize horn sequences by ear, not just by text.
- Tablet & Phone Support — Optimized for both phones and tablets. Study comfortably on any device.
- Multi-Language — Available in English, Russian, Spanish, and French.
WHO IS THIS FOR
- Maritime students preparing for COLREG / seamanship exams
- Captain's license candidates studying the International Rules of the Road for USCG exams
- Professional navigators refreshing collision avoidance rules
- Yacht skippers, sailors and boaters learning boat lights and sound signals
- Anyone working toward an offshore or coastal qualification
FREE & PRO
The free version includes core flashcards and quizzes supported by ads. Upgrade to Pro to remove all ads and unlock the complete theory library, full quiz bank, and sound signals content.
Download COLREG 72 and start mastering the rules of the road today.
COLREG 72 is an independent study app. It is not affiliated with or endorsed by the IMO, the U.S. Coast Guard or any maritime authority, and its practice questions are not official exam questions.
---
Support: [email protected]
WHAT IS INCLUDED
- Flashcard System — Card-based learning tied directly to COLREG 72 paragraphs. Review each rule at your own pace and track which cards you've mastered.
- Interactive Quizzes — Test your knowledge with multiple-choice quizzes. Instant feedback, answer statistics, and progress tracking help you focus on weak areas.
- Light Placement Quizzes — Put the navigation lights on the vessel silhouette yourself: masthead, side and stern lights, special signals. 74 hands-on questions across Rules 23–30 with hints and a light-by-light review. The fastest way to remember the nav lights of power-driven vessels, sailing vessels, tugs, trawlers, pilot boats and ships at anchor.
- Theory with Explanations — Full COLREG 72 theory content broken into digestible sections. Detailed explanations make complex navigation rules easy to understand.
- Sound Signals — Audio playback for all mandatory sound signals. Learn to recognize horn sequences by ear, not just by text.
- Tablet & Phone Support — Optimized for both phones and tablets. Study comfortably on any device.
- Multi-Language — Available in English, Russian, Spanish, and French.
WHO IS THIS FOR
- Maritime students preparing for COLREG / seamanship exams
- Captain's license candidates studying the International Rules of the Road for USCG exams
- Professional navigators refreshing collision avoidance rules
- Yacht skippers, sailors and boaters learning boat lights and sound signals
- Anyone working toward an offshore or coastal qualification
FREE & PRO
The free version includes core flashcards and quizzes supported by ads. Upgrade to Pro to remove all ads and unlock the complete theory library, full quiz bank, and sound signals content.
Download COLREG 72 and start mastering the rules of the road today.
COLREG 72 is an independent study app. It is not affiliated with or endorsed by the IMO, the U.S. Coast Guard or any maritime authority, and its practice questions are not official exam questions.
---
Support: [email protected]
What's new in 2.8.2
New question type: place the navigation lights on the vessel silhouette yourself. 74 light placement quizzes across Rules 23–30, with hints, a light-by-light review and a direct link to the rule.
Now in German too: interface, rule texts, theory and all questions.
Also new: on tablets the picture now sits next to the answers, so you no longer scroll to reach the options.
Also: Back to tests after a test; corrected silhouettes, light positions and wording in placement quizzes.
Now in German too: interface, rule texts, theory and all questions.
Also new: on tablets the picture now sits next to the answers, so you no longer scroll to reach the options.
Also: Back to tests after a test; corrected silhouettes, light positions and wording in placement quizzes.
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