6: Since the dial shows you the angles 0 to 180 to both sides it is difficult to read the exact degree. The cut out window shows the first digit of the degree the dials is set to. The side-color determines which number is valid. As 183 port (3 degrees beyond aft) is equivalent to 177 starboard. They are shown together because they are complementing to 10. But for some reason it jumps around a little as you set the needle.
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