How to Use Silva Compasses With Clinometer Scales

A clinometer (or inclinometer) is an instrument that measures the incline, or gradient, between a point of origin (where you are standing) and a point within your field of vision, often the horizon. If you know the angle of incline and also know the distance from yourself to the object, then you can calculate the height of the object, for example a tree, a building or even a mountain.



Several models of compass manufactured by Silva feature clinometers. In addition to the basic compass functions, they are useful for navigating mountainous and other terrain where gradient is an important feature of the landscape.

Things You'll Need

  • Compass
  • Map (optional)
  • Distance measure, calculator or slide rule (optional)
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Instructions

    • 1

      Use compass as usual for taking and/or calculating bearing or direction of travel.

    • 2

      Open the compass lid.

    • 3

      Rotate the compass housing or dial so that W (West) is aligned with the index pointer.

    • 4

      Hold the compass at arm's length and at eye level. Check that the clinometer needle is hanging vertically according to the vertical lines on the compass housing. The S (South) should point down.

    • 5

      Sight the object (usually the horizon), and align the compass's long edge along the line of sight. The clinometer needle will now indicate the angle of inclination, or slope of the terrain, measured in degrees (e.g., 4°).