SatData: Compass & Altitude

A compass, altimeter and GPS toolkit that works with no signal. SatData shows every reading your iPhone can produce — position, altitude, heading, accuracy, sun and moon — explained in plain words, for hikers, campers, geocachers and anyone who wants the numbers behind the blue dot.

Pay once and it's yours forever. No subscriptions, no in-app purchases, no ads — every feature included.

Everything is calculated on the phone, so it works on a summit, at sea and in a basement, with no signal at all. Every value says how sure the phone is and whether it was measured, derived or inferred. Nothing is made up.

NOW — WHERE YOU STAND
• Position in decimal degrees, degrees-minutes-seconds or degrees and decimal minutes
• Altitude above sea level, speed, heading and air pressure, every unit system shown at once
• A quality word from EXCELLENT to POOR on every reading, plus the age of the fix
• A compass card with true and magnetic north and the difference between them, steady at any speed
• The next sunrise or sunset with a countdown, and a map for context

NAV — FIND YOUR WAY BACK
• Mark where you are, type or paste a coordinate in any format, or pick a point on the map
• Follow a compass dial or one big arrow back to it, with distance, bearing and time to reach
• Straight-line guidance for finding the car, the tent or the trailhead again
• Up to twenty waypoints, kept on your phone

SKY — SUN AND MOON
• Where the sun and moon are right now, and when they rise, peak and set
• Golden hour, the three twilights, moon phase, age and distance
• Upcoming phases, equinoxes and solstices
• The Earth's magnetic field at your position from the World Magnetic Model

SURVEY — YOUR TIGHTEST COORDINATE
• Set the phone down and let it average fixes for 30 seconds to two minutes
• An honest statement of how tight the result is, and one tap to save it as a waypoint
• Ideal for hiding a geocache or logging a spot you need to find again

DATA — FOR PEOPLE WHO WANT EVERYTHING
• About two hundred fields: UTM, MGRS, geohash, Plus Codes, Maidenhead, Earth-centred coordinates
• GPS week and time of week, leap seconds, sidereal time, every accuracy figure iOS reports
• Barometer and magnetometer readings, and exports to GPX, CSV, JSON, NMEA and plain text
• iOS gives apps no satellite count or signal strengths, so SatData shows none and says so

BUILT RIGHT
• Pay once, own it for life — the price you see is everything
• No subscriptions, no in-app purchases, no upsells
• No ads, ever
• Megabytes, not gigabytes — no ad libraries, no analytics SDKs, nothing that isn't the app itself
• Nothing leaves your phone — no account, no tracking; the one online feature is Apple's map tiles, and the app says so when offline
• Made for iPhone, including both screens of iPhone Duo: opened up, every tab becomes two pages, one either side of the fold
• It also runs on iPad in an iPhone-sized window, without an iPad layout
• Follows your Larger Text setting

Download SatData and know exactly whe