South offset on first flight with 2.7.3.

Hello, i just updated my APM 2 ( GAUI 500X ) from 271 to 273 and i get a weird beahviour on first flight. My position looks to be "offseted" at 70 m on south at the beginnig of the flight ...

During the flight the positions get back to the normal position.

Here is a photo on Google Earth : http://i32.servimg.com/u/f32/11/72/78/09/apm_fi10.jpg

2 loiters on the top of the image to see my real flight zone.

The lower part shows the first minutes of the flight ( stabilize ).

The positions are 70 m away to south from their good position.

I know GPS can be "not so precise", but it looks that it corrected along the flight.

At the end, everything was fine and at the right place, as usual.
Anyone have noticed this ? I will try another flights and see if this remains.

The biggest problem is that my RTL point was surely at 70 m south from the real position ...

By chance my position to pilot is on north.

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