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The typical protractor-style compass is an optical compass. To shoot an azimuth with it you align marks on the compass and read the bearing off the dial. The other varieties have a sighting wire which is placed over the target and a separate mechanism to help reading the bearing. The primary advantage is accuracy because the bearing can be read while ...


5

Let's address what you refer to as "Grid declination". Unfortunately, there are two competing definitions: First, the definition you are conforming to, is that it is the angle from grid north to magnetic north (see NR Can) -- another name for which is grid-magnetic angle. A different definition is that it is the (generally very small) angle between true ...


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