On Sunday, November 11, 2018 at 10:25:00 AM UTC-5, wrote:
"Intention is to develop own fully secured tracking function with a
possibility of time delay."

It will be tricky to have open access to the hardware and software and also controlled, secure access to the tactical information.

I could see an open source/open hardware system with a mechanical seal protecting some internal private keys and the decryption engine that uses them.

Everybody would broadcast position protected by a public/private key pair.. CD puts the private key required to decrypt along with an approved software load into a standard, sealable receiver engine.

It would be nice to allow the contestant to play with everything, but I think secure will require at least some small part of the receive engine to be sealed.

My informed source says the time delay (10 minutes or so) would be used instead of encryption. The time delay can be built into the transmitter. Thus nothing in any receiver could foil it. There would not be an incentive for the pilot to change anything in their transmitter, unless they want to be leached on. I wonder though whether that would create an incentive to start 10 minutes after the best pilots?