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Aviation Altimeter is an extremely simple, fun and accurate tool for tracking your altitude both on the ground and in the air. GPS measurements calibrate your initial altitude, and then barometric pressure calculations kick in (iPhone 6, iPad Air 2 and Apple Watch 3 and above), to give you the most accurate altitude for your current location.For a one time upgrade, Aviation Altimeter Premium users will get the following great features:* See your current climb rate along with your altitude* Barometric altitude can be recalibrated from GPS automatically.* Additional themes are available for the main interface.* Magnetic or true north heading can be displayed, instead of just the GPS course.