Arducopter RTL Landing Distance from Takeoff

Hi All,

Is there any method available to refine the distance between where the vehicle lands (in RTL mode) in relation to where the vehicle was armed?

My quad will consistently (regardless of how much wind is about) land about 4-5 meters away from where I arm and launch it. I was hoping to get it at least under a one meter if possible.

Currently my quad is a basic HK 450 setup with latest Arducopter v3.2.1, Uboc GPs and external compass.

I have APM over the centre of gravity of the quad. It is isolated from vibration via a foam pad and the barometer is covered in foam as well. I have re-calibrated the compass manually several times and seem to have respectable offsets. It will fly missions, loiter and Alt Hold very well. 

Attached is a log file from a recent test mission.

Any assistance would be greatly appreciated!

Regards

Daryl 

2015-02-21 15-41-42.log

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