This will check the position of the aircraft in relation to the Departure Aiport before the start of recording and the position of the aircraft before the stopping of recording. If the aircrafts position is greater than 5 miles away from the airport a message will be shown to the pilot. Depending upon settings the pilot can ignore the message or the program can be set to not allow the pilot to continue until the position is repaired. The option also logs the starting and stopping distance. This option will be ignored when operating a charter flight.