Disabling the built-in GPS on APM 2
If you have an APM 2 with the built-in Mediatek GPS and would like to use an external and/or different GPS module, you can do so with some simple modifications:
Just solder a blob over these two pins, to short them out:
- With no external GPS, connect to APM via the Mission Planner. The HUD should report “No GPS”. That’s good — it means it can’t detect a GPS module. Now disconnect and remove the power from your board/remove the USB cable
- Connect your external GPS to the GPS port
- Connect the USB cable and connect via the Mission Planner again
- Once it connects, it should report “No Fix” (if you’re indoors or don’t have a fix yet) or “3D Fix” (if you’ve got GPS fix). Either are great — it means your new GPS was detected!
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