Ten-Haaft Oyster Vision II Operating Instructions Manual page 12

This satellite change takes some seconds after a fully automatic search. If
a satellite had already been selected before and no fully automatic search
had been started since that time as well as the vehicle was not moved,
then the adjustment happens substantially faster.
After renewed retracting and extending of the system, however, the
preset "search satellite" (see page 14) will be located again.
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