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The GPS-mate comes with its own little battery and an ON/OFF switch allowing you to keep your GPS on while changing batteries or getting ready for the first pack of the day. Once the drone is powered on it will recharge the GPS-mate's battery.
It also has an embedded VIFLY Finder 2 Buzzer which helps you find your drone if the battery gets disconnected.
NOTE: this is not a GPS.
GPS without compass (plug) diagram here
GPS with compass (solder) diagram here