[GPS] Support for M9N module and other u-blox 9 receivers #6269
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M9N deprecated some of the UBX protocol messages.
To make it work we need to account for it specifically.
For M9N and other u-blox 9 receivers the configured GPS protocol will not distinguish between
UBLOXandUBLOX7and will use special M9N flavor of the protocol.We also limit M9N to 5Hz to allow it to use all satellites in view and get better accuracy. The receiver can support 10Hz, however in this mode it will not use more than 16 satellites.