How do you use a Silva compass?

How do you use a Silva compass?

Lift your compass from the map and hold it horizontally in your hand. Turn yourself and the compass until the red end of the needle is inside the red north/south arrow. Now the sighting crossand sightwill point towards your destination. Take a landmark and start moving.

How does Silva compass measure strike and dip?

Measuring Dip:

1. AFTER you determine strike, rotate the compass 90°.
2. Place the SIDE of the compass flat against the plane.
3. Adjust the lever on the back of the compass until the air bubble in the “Clinometer level” is centered.
4. Read the dip directly from the scale in the compass.

How do you read magnetic declination?

An easy way to remember whether to add or subtract is “West is best and East is least.” So for West declination, add to the true reading (West is best, and therefore a larger number) and for East declination subtract from the true reading (East is least, and therefore a smaller number).

How do you calculate true north from magnetic north?

A true bearing would be 8° smaller than a magnetic bearing. Thus to convert from a magnetic bearing to a true bearing you would subtract 8°. The angle measured from the target to Grid North is also smaller than the angle measured from the target to Magnetic North.

How to draw a line with the Silva Ranger compass?

Introduction to the Silva Ranger Compass Parts of the Silva Ranger Compass. 1 Set compass to bearing of interest. 2 Orient compass on map so black lines (“Meridian Lines”) are parallel to North. 3 Draw line using edge of compass as a straight edge.

What are the parts of the Silva compass?

Parts of the Silva Compass Face Index Pointer Orienting arrow with red north end Meridian lines Clinometer Pointer (Black) Rotating bezel with 2o increments Clinometer scale M. Helper, Jackson School of Geosciences, UT Austin • Locate North, Set local declination • Measure Bearings

Which is the correct way to read a compass?

Hold the compass level – if the compass is tilted, the needle will touch the clear lid and not move correctly. Read the correct end of the needle. Use common sense, such as knowing that if you are in North America, Europe, or Asia and heading anywhere towards the sun during the middle of the day, you are heading in a southerly direction.

When do you Put your compass in your hand?

If you are north of the equator, stand facing the sun around lunchtime with your compass resting in your hand in front of you. Whichever end of the needle points towards the sun is South and the end that points at you is North. If you’re ‘down under’ the North end points towards the sun and the South end points at you.