TX1 from Primary provides UBX-NAV-PVT
TX1 from Secondary provides UBX-NAV-RELPOSNED
RX2 (OUTPUT) from Primary provides 4072.0, 1077, 1087, 1230 to the Secondary
SparkFun equivalent plumbing
From the u-Blox Moving Base Application Note
https://content.u-blox.com/sites/default/files/documents/ZED-F9P-MovingBase_AppNote_UBX-19009093.pdf
Example of orientation at the base, say to provide position and angle of a temporary run-way / flight deck
