My BIL and I tried to interest MSC in developing a lightweight signal emitter (cheap, mass produced), for this purpose, to be carried by anyone in the bush - trampers & hunters.
Maximum range in thick bush would've been 500-600 meters and directional, so you'd get a warning that someone was nearby and in your possible line of fire.
Thought about a warning light in the scope view, but final trigger operation would be the hunter's decision.
The signal would be line of sight only, so transmitters on the other side of a ridge wouldn't stop a shot.
Never heard back from MSC.
There's a patent out in West Germany for something very similar (intellectual only), but apart from the Garmin 2 way radio/GPS, not aware of any other equipment around.
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