What is it about?
App Store Description
avAltimeter is a digital, aviation-oriented altimeter. It is the only altimeter app which has the Kollsman adjustment so you can adjust the altimeter to the current barometer setting, or to 29.92 inches of mercury for the pressure altitude. Need a quick backup for your panel? avAltimeter uses the latest Apple and Bosch technology built into the iPhone 6 and later models. Earlier models of the iPhone and all current iPads do not have the required pressure sensing hardware and do not work with app.
avAltimeter calculates the temperature sensitive Density Altitude. Based on the Density Altitude, the app also calculates True Airspeed as a function of Indicated Airspeed. avAltimeter calculates a rough estimate of the increased required Take-Off distance from that at seal level from increased Density Altitude as well.
Know your oxygen requirements. avAltimeter tracks your altitude and provides a warning to use oxygen when you exceed FAA mandated limits.
avAltimeter is customizable. Choose Imperial or Metric units. Set the Altimeter Setting through a popup Kollsman window or by directly setting the field altitude. The field altitude can be set manually or automatically by GPS. Select Day or Night illumination. Turn the audio alarms for oxygen on or off. Improve the take-off performance estimate by selecting your propellor type: constant speed or fixed pitch.
The Bosch sensor chip built in to the iPhone 6 and later is sensitive to changes in altitude of three feet or less and has an estimated range from -1500 feet to over 20,000 feet.
Unlike other aviation apps, avAltimeter uses actual barometric pressure to calculate altitude, not a GPS estimate. The barometer is only available in iPhone 6 and later!
This is an app, not an FAA approved flight instrument. It has not been certified as meeting the relevant TSO specifications. This app can not be used as a primary flight instrument.