A compass is used to orient oneself using the Earth’s magnetic field. This lensatic compass, the type preferred by the military, are great for navigation and made to withstand the elements. There are a few differences from a basic compass. The sighting wire, which helps you determine direction. The thumb loop, which is used for stability to garner a more accurate reading. And the reading lens, which is where the term “lensatic” comes from. This compass is very sensitive. For best results, be sure to avoid use around sources of strong magnetic fields, such as power lines.
HOW TO USE A LENSATIC COMPASS
The compass-to-cheek technique for use:
1. Open the cover until it is at a 90° angle from the base.
2. Fold the lens holder slightly forward until you can read the degrees on the floating dial through the lens.
3. Look through the rear sight slot and align the front sighting wire with the desired object.
4. Glance at the dial to read the azimuth. Ensure the compass dial is floating freely.