Arrangement to level out compass deviation
System to compensate for the deviation of a ship's compass. Therefore several dolphins or beacons are positioned to allow for the accurate determination of the compass by visual targeting; determination and adjustment of the display accuracy.
translated from the Objektkatalog der WSV 2005 & www.boote-forum.de
https://www.boote-forum.de/attachment.php?attachmentid=696&d=1041588841 (retrieved 24.08.2017)