GPS can be connected to the Main Port Flexi Port or FlexiIO (Revolution), optional I2C mag can be connected to FlexiPort. (16.09 release) Be sure the Tx/Rx lines are crossed and external power source (+5v) is connected or board cannot talk with GPS. MainPort / FlexiPort pinOut
| Color | Pin | Electrical limits | Serial function | I2C function |
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| Black | 1 | GND | GND | GND | Red | 2 | limits 4.8V - 15V- 10V recommended 4.8 - 5.5V, check GPS voltage. | PWR Out (VCC Unregulated) | PWR Out (VCC Unregulated) | Blue | 3 | 3.3V | TX | SCL | Orange | 4 | 3.3V (5V Tolerant) | RX | SDA |
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