Since I use a good catapult for the launch then I will have to get a base reading on the launch - then and only then if the GPS reading is somewhat higher after a dive or some other aerobatics will I know my max speed. My ships are heavy so I am sure that the catapult launch speed can be beaten easily.

Am I missing something? My ship is a glider but I am sure this applies to ducted fan with bungee start as well also?

The Gps takes the max speed hit per flight and saves it for me...Havent tried it yet..