Curious about gps accuracy of 'gps for yaw'

Vehicletype ArduCopter
Firmware Version V4.0.5

gps1 is set to ‘UBlox moving baseline base’ and gps2 is set to ‘UBlox moving baseline rover’.

When analyzed with MAVExplorer, I found that the accuracy of gps2 is always lower than gps1. There was no problem with flying, but is it normal?

Also, in the EV of LOG, ‘gps primary changed’ occurred during flight. What does it mean and what conditions do it occur?

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