SARCO - whilst the CG can scramble a CG SAR helo within 30 miles of its (the CG unit's) location - the ARCCK has operational control of all SAR helo assets and theoretically, any job outside that 30 nm radius must be activated through ARCC.
The AIS transponder is a different piece of kit to the sat tracker but you are correct in that it gives visibility of the helos location to the MRCCs. The sat tracker will only give a feed to the ARRC and their RCS although there is a plan to make the RCS available to other users (MRCCs, ambulance and police control rooms etc) through the internet with password access - this will require the IT to work so probably won't be quick or cheap!!!!
Helinut - is it a weakness in the Airwave system or the aircraft installation that is causing the problems?