Sid,
On our aircraft, the handheld cradle fit terminal for our radio system already sends our position to one of the forces command and control systems - showing exactly where we are every 15 seconds and we have already proved that in the event of a mishap, the last location that the set transmitted will continue to be displayed until it is either removed or updated by a new "ping". The problem we have found is that nobody actually bothers to look at at it and the force IT security officer won't allow the data to be shared with any other force on the grounds of "security"
The same problem that prevents either of our forces accessing the latest information on the job they want us to go to.
The most effective and most cost effective system with the greatest amount of experience and training for co-ordinating police air support assets is already in place and has been for some time. As current and active practioners, both you and I know it, - but ACPO know nothing unless they've paid somebody else a small fortune to prove it.
The last thing we need is yet another box of clever things adding more weight to the aircraft.