Artyum, congratulations to an interesting project!

A couple of years ago I asked (pleaded) Jeti to develop exactly this feature for their GPS module (to work in combination with the transmitters speech output), but I was told it was too specific for them to be interested in it. I'm glad to see someone else has gotten this idea. I think it is the right way to use GPS information for F3A training. Basically GPS trail is not accurate enough to evaluate the geometry of the flown maneuvers. However, it is good enough to support the pilot with real time information of the aircrafts depth, high etc. I think your product is GREAT, but I think it would be even better if it was developed as a sensor for existing telemetry systems. Make the GPS unit in the plane process GPS data into height, distance relative to "flight plane", angular position in the flight sector, and downlink this data to the transmitter on its own telemetry protocol. Then it's is just to use the transmitters built in telemetry warning functions and speech output to set up the training support.