GME MT600G Manual EPIRB with GPS is a Category 2 EPIRB with a 10 year battery life and self testing capability. GME MT600G has a 66 Channel GPS Receiver that reduces the search area to less than 100m radius and a 121.5MHz homing signal to further aid in location. It works by transmitting the beacon’s Latitude and >Longitude as well as the identification of the owner for faster emergency response time. Once a GPS Fix has been obtained, those coordinates are sent in every transmission every 50s. In the first 6 hours the Navigation device shall attempt at least one Fix / location update every 30 minutes. Between 6 hours and 24 hours a Fix / location update shall be attempted at least every 2 hours. Between 24 hours and 44 hours a Fix / location update shall be attempted at least every 4 hours