74Log vs GPS Satellite Sky Map

73Log is a modern amateur radio logging app designed for ham radio operators who want to track their contacts (QSOs) easily and efficiently. KEY FEATURES: • Quick QSO Logging — Log contacts in seconds. Band, mode, frequency, and power carry over from your last QSO automatically. • World Map — See your contacts plotted on a map with lines showing your reach. Filter by band or mode. Toggle repeaters, QSOs, and grid squares on and off. • Repeater Directory — Browse, favourite, and contribute to a shared repeater directory. Long-press for quick programming details. Output/Input frequencies clearly labelled. • GPS & Grid Squares — Auto-fill your Maidenhead locator from GPS, or pick grid squares by tapping the map. Live distance and bearing to the other station. • All Bands & Modes — 160m to 13cm, SSB, CW, FM, FT8, DMR, D-STAR, C4FM, and more. • Callsign Book — Save operator info, mark favourite contacts, and look up callsigns on QRZ.com. • Offline First — Log contacts without internet. Everything syncs automatically when you're back online. • Cloud Sync — Your logs sync securely across all your devices. • Search & Filter — Find past contacts by callsign, band, mode, or date. • Distance Units — Choose kilometres, miles, or nautical miles. Whether you're operating from home, portable, or mobile, 73Log makes it easy to keep an accurate log of all your amateur radio contacts. 73!

See where you are, how good the fix is, and which GPS satellites should be overhead, predicted from public orbit data. SATELLITE SKY MAP A polar chart places the GPS constellation above you, computed from the public GPS almanac (US Coast Guard / CelesTrak) propagated with the standard orbit equations for your position and the current time. It is refreshed weekly and works offline from a bundled copy. These are PREDICTED positions, and the app labels them as such on screen. iOS gives apps no per-satellite data at all — no live signal strengths, no which-satellite-is-in-use, and no GLONASS or Galileo. What you see is where the GPS satellites actually are, not what your receiver is hearing from them. POSITION AND FIX QUALITY • Latitude and longitude, in your choice of format • Accuracy in metres with a plain quality rating • Altitude, ground speed and course • A gauge that tells you at a glance whether the fix is worth trusting WAYPOINTS Save a spot, navigate back to it with distance and bearing, and get an arrival alert. Export the lot as CSV or GPX. LOCK SCREEN CARD While the app is open, a Live Activity shows accuracy, altitude and speed on the Lock Screen and in the Dynamic Island. It cannot keep updating once the phone is locked — this app does not run location in the background — so it marks itself PAUSED rather than leaving a stale reading looking current. WHO USES IT Hikers and paddlers checking fix quality before relying on it · paragliding and drone pilots · surveyors wanting a quick accuracy read · anyone curious what is overhead right now Available in 25 languages.