Jake

Are they the same as aircraft ELT's (Emergency Locator Transmitter) in that they transmit on 121.5 (aircraft band) and I believe double that on 243?

We monitor that freq on our second VHF on our aircraft. We (and everyone else) refer to it as "On guard".

The reason I ask is that when we hear an ELT signal we automatically assume it is an aircraft, so this is a different twist.

I have seen those transmitters somewhere in a boating store, but I didn't notice what freq they were on.