GPS prevents motor arming/booting

Hi forum, I'm a relative newbie in that although I bought my AC about 6 months back, I've only now started working on it.

Problem: with GPS connected my AC2 won't arm the motors/boot properly. As soon as I disconnect the GPS cable I can boot and arm the motors. This situation follows 4 days of struggling to get the AC to arm the motors. I tried everything in the troubleshooting guide and went through every post in this forum that referred to motor arming problems. Eventually I found a post that related how a guy managed to arm his motors after removing his magnetometer. I figured the GPS was quickest to remove, and once I did that I was able to arm.

This problem happens whether or not my GPS has lock, and whether I use a MediaTek or a uBlox GPS module. I have two APM1.4s so I also switched IMU boards and the same problem persists. If anyone has any ideas I'd appreciate feedback. It must be located in the main board/software since all other components have been eliminated.

In the MAVLINK console I see that it says 'GPS disabled' whether or not the GPS is connected.

Equipment: uDrones Arducopter quad in X mode, with APM1.4. Running latest firmware.

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  • 3D Robotics

    Are you sure the GPS is plugged into the right port? It should be the one on the lower APM board, not the IMU board (which says "NO GPS")

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