Accurate Offline Altimeter for True Altitude Above Sea Level Anywhere on Earth

Altimeter is a precise and handy Android tool that delivers your true altitude above sea level (MSL) at your current position or any point worldwide. Designed for hikers, pilots, and outdoor explorers, it works fully offline using GPS data—ideal for backcountry navigation, mountain tracking, and travel in remote areas.

The app uses the trusted EGM96 Earth Gravitational Model to calculate accurate AMSL values, offering reliability far beyond standard GPS ellipsoid readings. Whether you're trekking, flying, geotagging photos, or planning coordinates with mapping tools, Altimeter provides professional-grade results with clear accuracy estimates. Perfect for offline mapping, outdoor elevation tracking, and precise location measurement.

Main Features

• Offline
• Works with no network (fully offline and flight-mode compatible)
• True altitude above sea level (AMSL using EGM96 geoid model)
• Supports Ordnance Survey National Grid reference system (OSGB36)
• Choose between Barometer or GPS Satellite altitude sources
• Shows address of your current location
• Save altitude readings for any location
• Altitude and horizontal accuracy estimation
• Check altitude at any chosen point on Earth
• Pick locations on a map for elevation lookup*
• Open photo geotags to view altitude linked to images
• Search locations by name or address
• Supports UTM and MGRS coordinate systems
• Home screen widget for instant altitude display