GPS accuracy depends on several factors including satellite visibility, weather conditions, device hardware, and cold start vs warm start. Wait 1-2 minutes for GPS to stabilize and ensure Location Services are enabled.

GPS altitude is calculated using satellite triangulation (plus or minus 15-30 meters accuracy), while barometric altitude uses atmospheric pressure measurements (plus or minus 3-5 meters for relative changes). Altitudo combines both for maximum accuracy.

Location access is essential for altitude tracking, weather data, astronomy events calculation, and safety alerts. Your location data stays on your device - we do not track your movements or share your location with third parties.

GPS location tracking, altitude, barometric pressure, compass, and previously loaded astronomy data work offline. Weather forecasts, UV index, and map backgrounds require an internet connection.

No! Altitudo uses one-time purchases only. Buy once, own forever. No recurring fees, no subscriptions. Premium features include free lifetime updates.

iOS: iPhone with iOS 15.0 or later. Android: Android 10 (API 30) or later. Barometer sensor recommended for best altitude accuracy.