I have a APM 2.5 and a little over a month ago started getting GPS fail messages. I purchased a new GPS and the problem did not go away.About the same time I started getting FAILSAFE warnings and was told to replace my receiver/radio also. (They were new units.So I received my new radio and receiver last night, programmed and installed, Calibrated everything...stepped back armed (GPS 3D-fix) applied throttle and....FAIL SAFE, GPS BAD...Any ideas?Frsky RX/TX, 915mhz tele, GPS, 250mw transmitter and OSD 6in away from GPS, GPS on top shelf of 3DRobotics Y6.
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Try running this test to check the APM's 3 volt regulator.