Heading with two GPS

Hallo and Hé,
We are working on a Heading projekt.
We tried, to use the position of two Ublox Neo M8N to calculate the Heading.
In the Test the two sensors are 2 meter separatet.

The problem is, the two Ublox have different position errors. That mean, one sensor is drifting to north, the other to the south, next minute vice versa. That seems strange for us, because both sensors have the same conditions. A Positionerror would be not a problem, but, both sensors must have the same error.
Some ideas?


You will not have the same error on all GPS. It seems ok for me.
The best solution is the combo between magnetometer and gyro.