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I picture would greatly help. However, I suspect you are looking at the lines on the part you manually rotate relative to the fixed base part. Good compasses have something you can rotate to set ...
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#1: Attribution notice removed
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System
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2020-06-03T15:54:21Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/11727 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/