1721 is accurate but image rotates

Ginger Lee

New member
Our Furuno Radar works well except that the image rotates slightly clockwise with every scan. In order to verify north, I have to zoom out and look for land masses. I have found reference to adjustments on the Main board in the manual. Do these relate to screen Hor/Ver, or will this solve my problem? (Verticle sync?). The other thought is that I have a bad Heading Mark Key S801?
Any advice from here would be really appreciated.
Mike
 
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