Why 6400 mils on compass

Silicone feet keep the compass from shifting. Tech specs Show Tech specs. Weight 86g Ideal for Professional trades Backpacking Emergency preparedness Hemisphere The earth's magnetic field varies considerably so most compasses are designed to work in the specific hemisphere zones for which they are being used.

Clinometer Measures angles of slope, elevation or inclination. Luminous markings Luminous markings allow you to read your compass in dim light conditions. Adjustable declination Sets the compass to indicate true north instead of magnetic north. Reviews No reviews yet. Be the first to write a review. Show Reviews. Ask and answer Number of questions: 1 Show Ask and answer.

Compare 0 Open Close. Compare Remove all. Professional trades Backpacking Emergency preparedness. Description Features Specifications The Spike Jet is the most compact model in the Spike Jet series with a smaller baseplate, smaller capsule and less details.

Jet 2. Spike Jet. Tax included. Shipping calculated at checkout. In stock, ready to ship Inventory on the way. Sold Out. Free returns within 14 days. Standard delivery time days. Some compasses may be marked in degrees only from 0 to See this example. It has 0 to 90 degrees from North to East. With this style of compass, readings such as North 20 degrees East are used.

That means 20 degrees towards East from North. A bearing of South 70 degrees West would be the same as degrees on a normal degree compass degrees for South plus 70 degrees.

A bearing of South 15 degrees East would be the same as degrees degrees minus 15 degrees. Mils : Another unit of measure, the radian, is used mainly by militaries in artillery, tank, and mortar gunnery. There are 2 PI radians in a circle. PI is a constant of approximately 3.

Divide each radian into mil-radians and you see there are mil-radians in a circle. Mil-radians are called mils for short. Compass use of mils typically rounds to for simplification. Some foreign militaries have simplified the other direction and divided the compass face into units, exactly like the face of a watch, with units the same angle as a minute on the watch face. Using mils, the actual size of an object observed in the field can be estimated. An object that appears to be n mils wide when it is units away from you, is actually n units wide - the units used does not matter, feet, yards, meters, miles A vehicle that appears to be 15 mils long and is feet distant is actually 15 feet long.

Or, two vehicles that appear to be mils apart and are meters away, are actually meters apart. Conversely, if you know the size of an object, you can estimate its distance from you.

If the tops of two mountains are 1 mile apart on your map, but they appear to be mils apart, you must be 10 miles away. Sighting on a man approximately 6 feet tall who appears to be 12 mils tall must be about feet away.