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I just purchased a Ritchie bulkhead compass for my 1984 MacGregor 25. The mounting specifications specify a shim to create a 90-degree angle to the water surface. Does anyone out there know what represents a true angle for the port-side bulkhead (which also serves at the forward wall of the cockpit and stern wall of the cabin? There are no reference points to work off of since it appears when the boat is at rest on the water there are no straight lines or vertical lines relative to what may be the water surface or even to the centerline of the boat. The bulkhead I’m referencing is angled slightly forward (vertical axis) and very slightly forward (overhead axis, working from companionway entrance to port side of the boat.
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