I am looking for a tracking device simmilar to this
GPS tracking devices. Low cost high quality GPS tracking devices.
which can be used in the helicopter with STC or however accepted by the authorities. This system should not require an onboard power supply and it should not be possible to switch it off.
The idea behind is to track the time in a leased helicopter from a remote position at the other side of the world. In short words, we want to have some reliable source to verify the log entries.