Rover drift from the waypoint and Data flash log showing the GPS bias from the actual position

ArduRover Rover 4.6
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1

I am Currently building an rover , and the rover itself get divert from the mission waypoint , while observing the log there is bias in the GPS location , is this the reason Rover can not trace the path properly , I am attaching the log file link

2

Yes, you need better GPS signal quality and you need to tune the vehicle so that it follows the desired path better.

3

I am using CUAV neo 3 pro GPS , and is there advise that you may give regarding tuning

4

I can’t open your log file. Please unlock the google link.
In which terrain you are driving?
Do the GPS receiver has a clear view to the sky in all directions?
Are there some buildings, trees, hills arround?
Which GNSS system you are using? Sometimes it is better to only use one system.

5

Try a GPS with RTK, very well supported in Mission Planner.

6

I have update the google link , Yes there are buildings in right and in the back

7

I am still not able to reach your log file. The link above still asked for access rights.