There is no doubt that GPS is a system bottleneck, however, during last year's tests, it turned out that the accuracy is very sufficient to fly F3A. GlobalTop modules have admittedly slight delay readings (0.5-1 sec), but after a few flights the pilot is able to compensate for the delay by faster reactions. You can feel it in the air, it is hard to explain in writing The best among the tested modules were u-blox 8, for which the delay was minimal.

As for the height indication, only u-blox 8 gaves measuring accuracy of 10-20m. The height given by the other modules was completely unusable. RCFA system is equipped with an altimeter, which indications are incomparably better than any GPS. For those who want to verify GPS altitude accuracy, the build-in altimeter can be disabled.

Another problem is loosing GPS fix during aerobatics when direction of the GPS antenna changes, but this is rather rare situation (1/10 flights). In most cases, the fix is recovered after a few sec during the flight. You have to remember that the GPS signal is strongly dependent on weatcher conditions and available satellites. Sometimes when fix is recovered the position is far from correct a few dozen meters, which is definitely confusing to the pilot, who suddenly hears the sound "outside the area" while the plane can be perfectly in the "line of flight".

These types of problems are natural. They can be reduced but they can not be effectively eliminated.

Thank you You were not alone who asked recognized producers to develop this kind of system. I also was thinking of using existing telemetry but came to the same conclusion as Jeti

Thank you Actually we didn't make tests with multiple persons indication position in the Flight Area. It would be interesting.