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Just receive my APM and APM IMU

I will solder everything reel soon and I want to add some other sensors like sonar sensors. I saw that the APM have some available pins in the documentation but, I can't see witch ones. It's hard to figure because when APM and APM IMU are plug together, it look like all pins are used by the IMU and the only way to know with one are not used is by parsing the code!

Is there some documentation somewhere about that?

thank