[ZenGum]

Haggis at Capn and Lookout.

As I understand it, the marine epirbs are different.

(1) signal strength is the same, because the signals all go directly to satellite.
(2) Marine EPIRBs (a) must work for 48 hours rather than 24 for PLBs, even after 7 years storage; (b) must float upright with the antenna clear of the water (PLBs merely have to float so you don't lose them) and (c) many come with mounting brackets, float-free release systems, and water immersion activation features. (i.e if your boat sinks, the EPIRB automatically detaches itself and starts transmitting).

And they're big and tough and go HOOO-AHHH!!!! a lot.