Fig 1.1 - Inside of APM 2.8
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Fig 1.2 - Internal Pinout of APM 2.8
Fig 2.1 - Input channels of APM 2.8 (For connecting the Receiver Module)
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Fig 2.2 - Connection of Receiver to APM 2.8
Fig 3.1 - GPS + Compass connection with APM 2.8
NOTE -
In the APM Module, there is an I2C port below the GPS Port.
For connecting the compass of the GPS module, that port below the GPS module can also be used.