How do I use a prismatic compass?

Answer

Using a prismatic compass first entails selecting the bearing and opening its lid, then folding it flat. Next, undo the curled knob, and move the bearing to the top. This is followed by tightening the knurled knob and lining up the two illuminated sticks. Finally, move the compass, and point it forward, ensuring that the two illuminated sticks do not separate.

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