GME makes some good equipment (EPIRBS). They do the battery replacement different than everybody else. Most EPIRBs have to be sent in to a special facility for battery replacement and testing every 5 years or so. Instead of putting a new battery in an old EPIRB, GME pulls the circuit board out of the old one and put it in a new housing with battery. That way your information is still there but you basically get a new EPIRB instead of just a battery. Price is pretty much the same as for a battery only.