Lacerta M-Gen User Manual page 28

The RD positions are fix so reproducable. The positions are indexed in the device that
starts from 0 at power-on. This first position (offset) is always (0,0). Later the index grows but
can't be reset to 0 currently. If You stop the autoguiding and restart again, remember that the
star may be located somewhere but not where it was at starting the autoguiding. In this case
the autoguiding center changes and the new RD movements are done around that point.
The RD movement is not done exactly. The new position may differ from the calculated
one a little bit. This behaviour is to save time at RD movement, leaving more time for the
exposures.
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