How to Read an Engineering Compass

A compass helps you navigate by following a needle which points towards magnetic North. In most parts of the world, you can use magnetic North as true North. Engineer compasses include different markings than a conventional compass, with two lines marked on the face at an angle of 45 degrees to each other. Use these lines for navigation in fog and or with a map to find positions.

Instructions

    • 1

      Lay out a map on a flat surface. Align the line on the map that indicates North with the magnetic North reading on your compass.

    • 2

      Point the compass at an object. Read the number of degrees on the scale through the lens to take an azimuth reading (the direct line from the middle of the compass to the object).

    • 3

      Take an azimuth bearing for two objects on the horizon which you can also see marked on the map. Draw two lines on the map which correspond to the azimuth bearing. The point where the lines intersect is your position.

    • 4

      Rotate yourself so that your compass points North. Rotate the glass bezel until you align the luminous line in the direction that you wish to travel. Walk in the direction of the luminous line while keeping the compass pointing towards magnetic North. You can use this technique to keep a straight line when navigating in the dark or fog.