The 4 pins on the left side are labeled GND, BTX, BRX and BVDD. The 4 pins on the buttom side are labeled GRX, GTX, VBAT and VBUS.I guessed the BT module might use GND/BVDD for power and BTX/BRX for serial data and the GPS module might use GND/VBAT for power and GTX/GRX for serial data - and I have no idea what VBUS is for.
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