AlwaysNRST app for iPhone and iPad

Do you always know your nearest airport? You should! AlwaysNRST can help improve your situational awareness. Designed as a training aid for students and instructors alike, this utility will help keep your "ADM" (aeronautical decision making) skills sharp by continuously telling you the location of the nearest airport to yourself.

AlwaysNRST uses your devices GPS to provide a realtime display of fixed-wing airports in your vicinity, along with continuously-updated Direct-To routing to the closest one. Input your aircrafts glide ratio and AlwaysNRST will color-code the course line to indicate your probability of reaching that field in the event of an engine failure.

AlwaysNRST requires no network connection to operate - it has thousands of airports in its database, and can perform its functionality offline.

Features:
+ Nearly 34,000 WORLDWIDE fixed-wing airports included in the app
+ Realtime calculation of Direct-To routing to closest airport to you
+ Native iPhone AND iPad interfaces (universal app)
+ Color-coded course line indicates probability of reaching airport without power
+ "North Up" and "Heading Up" modes
+ No network required for airport display and direct-to calculation
+ Compatible with external GPS receivers like the Dual XGPS150

This is just version 1 of AlwaysNRST. The author is a certificated instrument aviator, and is eager to add new features as requested by his fellow aviators.

Note: the satellite basemap itself will only display without network if it is cached on the device. Even if you do not have cached map data the app will continue to function and provide you airport and direct-to information.