Reported Square leaping back and forth?

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Joined: 2009/10/17 - 11:06
Reported Square leaping back and forth?
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We are monitoring G4HS0/M which, as you can see on the website, is a yacht crossing the atlantic. Many stations are picking up the signal.
However, from time to time, we are receiving an odd effect whereby the reported square seems to jump back and forth. The attached screenshot
shows the effect - the square is being reported as HM58qm and HM58rs (or HM58rr). These two squares are 17.85 miles apart. Some stations ( eg. G4SFS ) are reporting both positions. Has anyone seen this before and have any advice? A GPS error would surely give a more random spread. The yacht is not actually moving at present - being in port! Note: we are trying to sort the high drift - could this cause such a consistent error?