The Flight-ID, is additional to the Hex-ID and it provides the registration of your aircraft to the navigation applications used by other PilotAware units.
By entering the aircrafts registration into the Flight-ID section, Rosetta will provide your aircraft's registration to other PilotAware allowing for greater situational awareness and increased information.
If you change aircraft you will need to change the Flight-ID. Our 'Profiles' feature allows for the easy transition between aircraft. Take a moment to look through the profiles, to get the most out of Rosetta.