no power on gps socket side apm2.5

good morning to all

i 'm discovering APM and i have some issue with the GPS side socket on the APM 2.5

i loaded the quadcopter 2.8.1 with the mission planner 1.2.29 and i use the 3dr gps mtk v2

my copter is flying well but i can not use the gps, it does

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