"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.