CUAV NEO 3 Pro GNSS Module, u-blox M9N, CAN Bus

Everything that makes the standard NEO 3 a solid GNSS choice carries over here - the same u-blox M9N chip and the same CUAV build quality - with the one meaningful difference being a CAN bus interface instead of standard UART/I2C wiring. That matters specifically for a build that's already committed to CAN for its other peripherals, where a non-CAN GPS module would be the one odd piece breaking an otherwise-consistent communication bus across the whole flight stack.