Top Altimeter: GPS Elevation

Top Altimeter is a GPS elevation tracker and altimeter that fuses GPS, barometer and EGM96 into one stable, precise altitude reading, auto-logs every climb with elevation curves, and works fully offline with GPX/CSV export. 🌍 **Four elevation sources** - EGM96 geoid-corrected altitude (recommended, most stable) - System MSL altitude (Android 14+) - NMEA GGA altitude - WGS84 ellipsoid raw height Every fix runs a health check: we watch for stationary drift, spikes, out-of-range values and accuracy, then recommend the steadiest source. 🌡️ **Barometer fusion** On devices with a barometric sensor, pressure data is fused with GNSS/GPS for smoother readings; when no sensor is present it falls back to pure GNSS. 📝 **Auto logging** Record by time interval or by elevation-change threshold, with background persistence so logging continues even when the screen is off. Browse the list entry by entry, and the chart shows total ascent, peak, duration and data-point count. You can also check in manually to capture your current altitude and GPS coordinates on the spot. 📷 **Altimeter camera** Snap a photo with an altitude watermark — elevation, unit and GPS coordinates are stamped right onto the image, ready to share. 📷 **Photos, video & notes** Attach a photo or video of the scene and add a text note to any elevation entry — remember not just the number, but the moment. 🛰️ **Satellites** GPS, GLONASS, Galileo, BeiDou & QZSS — See which constellations are in use and the C/N0 signal strength of every visible satellite. 📤 **Export** Export any time range as GPX (Google Earth, Strava, Garmin) or CSV. Your data stays on the device — no account, no server, no tracking. Works offline, no internet required. 🎨 **Your badge, your style** Choose a classic aviation dial or a modern look, adjust shape and size, pick light/dark themes, and switch between meters and feet. 🔒 **Permissions** - Display over other apps — to show the floating altitude badge above other apps. - Location (including background): keep altitude updated and keep recording while the screen is off. ⚠️ **Note:** this app is not a survey-grade instrument; readings are for reference only.