They can pinpoint anyone with a turned off one, too, if it's modern - just visit your local PI convention and be prepared to sh*t yourself with the amount of ways you can be spied upon.
There are around 150 computers in the average airliner, all networked together, and it will probably be proportionately so in helicopters as they progress - did someone mention that the new B3's throttles are now completely electronic? Some helicopters do everything electronically.
Any PC network technician (like wot I am) can tell you how sensitive the signals in a network are. Luckily, the 407's FADEC transmits signals to the engine with RS232, which is out of the ark. Sure, in a 206 or something, especially a VFR machine, there shouldn't be a problem, but, as I mentioned before, the Super Puma may suffer. And if the wiring loom in the Gazelle is anything to go by, others, too.
Phil