How to Pick Out a Compass

The two main types of compasses to choose from are magnetic and digital. A magnetic compass contains a magnetic needle mounted to an almost frictionless pivot, allowing it to point to magnetic north. A variety of features increase its accuracy, including declination adjustment, needle dip correction and easy to read degree markings. It is important to check a prospective compass for these features. Digital compasses can be worn on the wrist or held in the hand. They are generally more expensive than magnetic compasses, but they're easy to use. Some digital compasses also have built-in GPS for position location.

Instructions

  1. Picking a Magnetic Compass

    • 1

      Select a compass with a declination adjustment for calibration with a map or table of compass declinations, such as the map at Compassdude.com

    • 2

      Choose a compass with needle dip correction. The needle will dip towards the earth as the user approaches the north and south poles. There are five needle dip zones, according to the Roadside Nature blog. The compass should be adjusted for the area.

    • 3
      Pick a compass with azimuth markings.

      You want azimuth markings -- rather than quadrant markings -- for degrees. This makes it easier to read.

    • 4
      Compass with blue meridian lines.

      Select a unit with meridian lines to plot more accurate courses when using a map.

    • 5

      You want a needle suspended in liquid. This will stabilize the unit by dampening movement.

    Selecting the Right Digital Compass

    • 6
      A handheld digital compass needs to be readable.

      Choose a digital compass with an easy to read display and good backlight that may be seen in bright sunlight or in the dark.

    • 7

      The unit should be waterproof in case it lands in water. It also should float.

    • 8

      Make sure the digital compass has a declination adjustment.

    • 9

      Handheld models should come with a lanyard and carrying case.

    • 10

      Choose a system that stores locations during a trip, in case you have to backtrack.