Create your flight planning and let the application do all the calculations for you. The F.PBush Pilot version allow you to create a data base of locations based on GPS coordinate. Re-use this locations for calculate distances between them in your planning and calculate flight time, fuel etc... for your flight planning.
-YouTube link on how to use the Data Base:
https://www.youtube.com/watch?v=kWDkRC9m2-c