Altimeter X vs Altimeter Dashboard

iOS/GPS altitude Altitude estimated by the device's location service. It works reasonably well in most situations but can't track small changes and can be unreliable indoor. Barometric altitude (iPhone 6 minimum) Altitude based on the device's barometer. This is how most hardware altimeters work. It can track very small relative variations but must be calibrated with weather data or GPS. Calibration with weather data grabs current sea-level pressure and temperature at your location from a nearby weather station. GPS calibration takes the current iOS/GPS altitude as a starting point then uses the barometer to track changes. Elevation database This method displays earth surface elevation at your location by polling an elevation database. It works even with very imprecise location data but requires network access. Surface elevation usually includes buildings and trees.

Altimeter Dashboard is a clean, automotive-style altitude and compass dashboard for iPhone. Features: • Large, easy-to-read compass display • GPS and barometric altitude measurement • Real-time heading and directional display • Vehicle display support on compatible in-car systems • English and Japanese localization • Metric and imperial units (metres and feet) • Altitude and heading accuracy information • Altitude trend indication (rising, stable, or falling) Privacy first: • No user accounts • No advertising • No analytics • No tracking • No subscriptions • No in-app purchases All location, compass, motion, and barometric data are processed on your device. Use only when safe and legal to do so.