"three-point positioning" of compass?

The compass was invented by China. But in terms of orientation, we call it a compass. Because the red pointer always points to the north.

PWT8M type

PWT8M thumb compass

Instructions for use:

1 Put the compass on the left thumb and horizontally on the map. Point the blue arrow on the right side of the compass from where you are to where you want to go.

Then rotate the compass horizontally with the map (your body rotates with it) until the red pointer on the compass is parallel to the north of the red line representing the north-south direction on the map.

At this time, the direction pointed by the blue arrow on the compass is the correct direction you want to go. Go!

How to choose a compass

Compass is one of the necessary tools for people engaged in outdoor activities, especially in areas where there are few outsiders. Being good at using compass orientation technology and combining with correct map guidance can help you find your position and the direction you want to travel after you lose your path or direction, and then get out of trouble safely.

In the following, we will tell you some ideas about the compass:

Types of compasses

Basic compass: a type suitable for beginners. It has the basic functions that a compass should have, and the price is relatively cheap, but it lacks some conveniences and auxiliary devices, such as adjustable deflection lines and sights.

Professional compass: it belongs to the type of full-function use. If you are an outdoor player who already has the skills to use a compass, it is better to spend more money on this compass with multiple auxiliary devices, which will make it more convenient for you to judge the direction when using the compass.

Decorative compass: This kind of compass is often used as a key ring or a watch. The compass itself usually has no base plate on the map. Most of their functions are to quickly point out the general direction of the north, but not to accurately point out other directions.

A red magnetized needle is usually used at one end of the pointer to indicate the direction of magnetic north, not the true north direction of the earth. The difference between the position of the Earth's magnetic north and the position of true north is more than 1000 miles; Therefore, the deviation angle between magnetic north and true north must be adjusted according to the map in order to obtain the correct direction or position.

Liquid-filled capsule needle box should include magnetic needle, magnetic needle bearing and liquid. The liquid is used to protect the magnetic needle from colliding with the needle box and reduce the movement of the pointer in the reading direction.

The rotating azimuth circle is engraved with an angle of 0 to 360, usually with a scale of 2 degrees, and is engraved around the outside of the needle box. Azimuth is the direction you should go.

The bottom plate is a rectangular plastic plate, which is usually placed under the needle box, so that the compass can be placed on the map for easy direction interpretation. A better bottom plate with a scale table attached to the edge can be used to measure the distance on the map, so as to compare it with the scale on the map and calculate the actual distance.

Fixed magnetic directional arrow and parallel warp-the magnetic directional arrow is arranged at the bottom of the needle box and can rotate with the disc; When positioning, align with the map to the magnetic north. The parallel meridian is parallel to the magnetic north positioning line, which can assist the magnetic north positioning line to mark the correct north.

An indicating line or a traveling direction line is arranged on the bottom plate to indicate the direction that should be traveled.

Introduction to Compass Components [Professional]

Adjustable magnetic declination adjustment Every time you engage in outdoor activities, you must take the magnetic declination into account when using the compass for positioning for the first time. After setting the adjustable declination adjustment, every time you use the compass in the future, as long as the north of the compass is aligned with a straight line, the forward direction line on the bottom plate will indicate the direction you should go. There is no need to consider the difference of magnetic declination every time.

Magnifier is slightly smaller than ordinary magnifying glass, and is used to observe smaller symbols on the map on the bottom plate.

Sights are very useful when aiming at long-distance targets. It can also be used as a signal and personal mirror.

The luminous indicator is generally placed on the magnetic needle, and there are luminous indicators on the arrow line or even four azimuth angles on the needle box.

Inclinometer can be used to measure slope; Used to predict the danger of avalanche or the height of destination.

The lanyard allows you to tie it on your backpack or belt, which is convenient to carry.

Which compass suits your needs?

Basic compass: Basic compass is enough for beginners, unless there is a strong desire to upgrade their ability to a higher level. Leisure people who are generally engaged in outdoor activities rarely stay away from the existing trails, so it is very appropriate to use the basic compass with average price. As for the professional compass with some special functional designs, although it will be more convenient to use, it is not much different for users who only play occasionally.

Professional compass: For a professional compass, the function of adjustable deflection line is one of the necessary functions. If you are often outdoors with few people, it is worthwhile to spend more money to buy a compass with adjustable deflection line function. In addition, the additional sight function is also a good choice.

Pay attention to the use and storage of the compass.

Metal objects will affect the interpretation of the compass, so when positioning or interpreting the direction, try to stay away from vehicles, cameras or other metal objects. Metal interference will affect the interpretation of the compass from 20 degrees to 60 degrees, so be sure to pay attention. The area of magnetoelectricity will also affect the accuracy of the compass.

Pay attention to the storage position when storing the compass, and don't put it in a place full of electromagnetic effects, for example, don't put it on the speaker of a sound box. The electromagnetic field above the speaker is very strong. In addition, exposure will weaken the magnetism of the magnetic needle, which is also unfavorable to the compass.

The four directions of a compass: east, south, west and north, are usually called azimuth base points.

The short rope attached to the compass can be tied on the belt, jacket and backpack, and should not be hung around the neck as far as possible, which is prone to danger when engaging in technical climbing.

A compass without a bottom plate is not suitable for mountain climbing because it can't be used with a map.

When using a compass to find a route, the scale of the compass itself should be accurate to 1 to 2 degrees.