This app is an intelligent flight instrument that reads altitude. It is designed for devices that contain a barometer. This includes iPhone6, iPhone6s, iPhone6 Plus and iPhone6s Plus models running IOS 8.0 or later. For altitude reading it automatically retrieves the QNH or AS Altimeter Setting from the web and uses it in combination with the pressure sensor (barometer) to determine the actual altitude. You can either select an ICAO METAR station, like EHAM or KJFK for Schiphol and JFK airports, or enter the QNH directly in the app. It is ideal for a number of air sports to be used as a backup. Besides altitude and flight level this instrument also displays true heading and speed. The indicated values are displayed using a large font so they can easily be read from a distance. When backgrounded, this app is inactive to save power.
- GPS (required)
- Barometer (strongly recommended)
The altimeter is using the barometric pressure sensor of the iPhone when available. For devices that do not contain a barometer altitude is measured in the conventional way using a GPS. Pilots who fly airplanes, gliders, hotairballoons or other airframes are familiar with altimeter settings. This setting is retrieved by looking up a METAR report for a given area, most often an airport, and locate the QNH or AS value in it. This value is then used to setup the aircraft altimeter. This device automates this process by retrieving it from the web and then automatically use it to setup the airfeet instrument. It is possible to override the automatic retrieved value by entering the QNH or AS value manually. When the field is touched the keyboard will popup and the value that could be manually entered. Same is true for the ICAO station identifier like EBBL or KBOS. Next to the ICAO station field the activity indicator will show up when network access is in progress. This will only happen at app startup or when the manual “update QNH” or “update AS” for USA key is selected. Selecting “flight level mode” by using the “QNH-FL” switch on the bottom of the main screen, 1013.25 millibar or 29.92 inches of mercury reference pressure is used. In this mode the “altitude” label will change to “flight level” and the indicated value will be the level in feet or meters. This mode is only available for devices that contain a barometer and will be disabled on other devices.
The GPS is used to determine the heading. The indicated true heading in displayed in degrees. Magnetic heading is not available. To work reliably an adequate GPS signal is required.
For speed measurements the GPS needs to be operational. The speed can be set to knots or kilometers per hour. For this the “speed .x knots” or “speed .x kmh” settings are available. The set value determines at what speed a digit after the comma is displayed. When this setting is for example, set to 25, the speed below 25 is displayed as 24.2, and 25 and above is displayed without extra digit to make it more readable.
Version 3.0 Enhanced manual QNH settings when no network is available to automatically retrieve this.
Version 2.0 new feature, automatically locate nearby airport option is now available. The station/airport field contains a small A or M indicator in the left bottom to indicate Automatic or Manual mode.
Version 2.1 new feature, the QNH is now automatically updated when the app is started and "Get AS at startup" option is selected.
Version 4.4 Update airports for QNH retrieval.
What's New in Version 6.6
Updated internal airports database for METAR retrieval.
VPP Device Licensing
iOS 12.0 or later
iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XR, iPhone XS, iPhone XS Max, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone SE (2nd generation), iPhone 12, iPhone 12 Pro, iPhone 12 Pro Max, iPhone 12 mini, iPhone 13, iPhone 13 Pro, iPhone 13 Pro Max, iPhone 13 mini, iPhone SEThirdGen, iPad (5th Generation) Wi-Fi, iPad (5th Generation) Wi-Fi + Cellular, iPad (6th generation) Wi-Fi, iPad (6th generation) Wi-Fi + Cellular, iPad Pro, iPad Pro (Cellular), iPad Pro (9.7-inch), iPad Pro (9.7-inch) (Cellular), iPad Pro 12.9-inch (2nd generation), iPad Pro 12.9-inch (2nd generation) Wi-Fi + Cellular, iPad Pro (10.5-inch), iPad Pro (10.5-inch) Wi-Fi + Cellular, iPad Pro (11-inch), iPad Pro (11-inch) Wi-Fi + Cellular, iPad Pro 12.9-inch (3rd generation), iPad Pro 12.9-inch (3rd generation) Wi-Fi + Cellular, iPad Air, iPad Air (Cellular), iPad Air 2, iPad Air 2 (Cellular), iPad Air (3rd generation), iPad Air (3rd generation) Wi-Fi + Cellular, iPad mini Retina, iPad mini Retina (Cellular), iPad mini 3, iPad mini 3 (Cellular), iPad mini 4, iPad mini 4 (Cellular), iPad mini (5th Generation), iPad mini (5th Generation) Wi-Fi + Cellular, iPad (7th generation) Wi-Fi + Cellular, iPad Pro 11-inch (2nd generation), iPad Pro 11-inch (2nd generation) Wi-Fi + Cellular, iPad Pro 12.9-inch (4th generation), iPad Pro 12.9-inch (4th generation) Wi-Fi + Cellular, iPad Air (4th Generation) (Wi-Fi), iPad Air (4th Generation) (Wi-Fi + Cellular), iPad (8th generation) Wi-Fi, iPad (8th generation) Wi-Fi + Cellular, iPad Pro 11-inch (3rd generation), iPad Pro 11-inch (3rd generation) Wi-Fi + Cellular, iPad Pro 12.9-inch (5th Generation), iPad Pro 12.9-inch (5th Generation) Wi-Fi + Cellular, iPad (9th Generation), iPad (9th Generation) Wi-Fi + Cellular, iPad mini (6th Generation), iPad mini (6th Generation) Wi-Fi + Cellular, iPad AirFifthGen, iPad AirFifthGenCellular, iPod touch (6th Generation), iPod touch (7th generation), Apple Watch Series 4