What is the north needle
The north needle is a Tool for indicating directions. It is widely used in various directions, such as navigation, field adventure, urban road map reading and other fields.It is also an indispensable Tool for mountaineering adventure. The basic function is to use the Earth's magnetic field to instruct the northern position. It must cooperate with the map to find a relative position to understand the position of its own place.
The northern needle symbol is generally represented by uppercase letters n (north), which is generally applied to black or blue, so as to distinguish the red S (south).
Several types of pointers are divided into
Basic Type North Needle
North Northern Needle Picture
Suitable for beginners to use the types of entry. It has the basic functions that the northern needle should have, and the price is cheap, but lacks some use convenience and auxiliary appliances such as adjustable polarization lines and sights.
Professional pointer northern needle
It belongs to the type of full functional use. If you are an Outdoor activity player who already has the technology of northern needles, it is better to spend more money to buy a northern needle with a number of auxiliary appliances.It's more convenient.
Decoration northern needle
This type of northern needle is often used as a key ring or paired with a watch. The northern needle itself usually has no bottom plate to put it on the map.Most of their functions can quickly point out the approximate direction of the north, but cannot point out the rest.
military pointer northern needle
The military pointer northern needle is mainly used in the practical operation of military topography. It has functions such as directional angle measurement, fast map operations, calibration maps, determining the marching line of marching targets, estimated target distance, measurement of pitch angle, and measurement height.
Why isn't the compass called the northern needle
In ancient my country, "Sinan" was used to indicate the direction, so modern calling compass is also a traditional habit.And in ancient Chinese culture, the south is yang, the north is yin, and the living people are respecting the yang.The emperors are sitting south to the south, and the doors and windows of the main house are opened to the south.Therefore, the direction of the instructions is mainly south.Detailed & gt; & gt;
The difference between the compass and the northern needle
Different scope
Guidelines are used first in sacrifice, etiquette, military and divination and divination, and determine the orientation when watching Feng Shui; the north needle is a Tool for instructing the direction.field.
Different indications
The main component of the component of the compass is a magnetic needle installed on the axis. Under the action of natural magnetic fields, the magnetic needle can rotate freely and keep it in the cut line of the magnetic meridian.Pointing to the North Pole of the earth, you can use this performance to distinguish the direction of the instructions.
How to use the northern needle
How to look at the northern needle in the plane map
The northern needle of the northern needle on the floor plan is to help people position it. When used, first find the position of the northern needle on the drawing, and then according to the principle of the upper north, the north, and the east.You can understand the orientation.
How to measure the angle of the northern needle
When measuring the target orientation angle, the actual location must be parallel to the North and the Map of the map, and then use the red of the northern needle to line the target to the target., That is, the target aura angle.
Pointing method of north needle
1. Direction line meeting method
This method is to use the known points of the two maps to measure the target orientation corner of the unknown point of another map. The extension of the two target horn angles must be submitted to this unknown point.
Example: When we lose direction or want to know ourselves at the location point (C) at the map, we first look around the terrain peak around the world, and choose two target points (A, B) that can be clearly marked at the map, so we can measure the measurement that has been measured.The target position angle of the knowing point (point A, B), and at the same time the point of the extension of the two -way corner extension is our position point (point C).
2. Use the location relationship to determine
When the standing point is located near the obvious terrain point, the position relationship can be used.The positioning point of the positioning method is mainly based on the two elements, one is the direction of the standing point to the obvious point, and the other is the distance from the standing point to the obvious point.In places with obvious terrain, you can also determine the height difference.
3. Use the "Payment Law" to determine
When there is no obvious terrain point near the station standing point, you can use the "Jiaotong Law" to determine the location of the standing point.According to different situations, it can be divided into the 90 method, line -off method, rear meeting method, and magnetic position corner meeting method.The advantages of these methods are: no need to judge or measure distance can also determine the more accurate standing point position, which is very meaningful for beginners to learn and consolidate the training of off -road diagrams.However, some of their methods can only be used under certain specific conditions, or they are cumbersome and time -consuming, so it is generally less used in directional off -road competitions.
4. Cross -line method
When the point of the test is located on the linear terrain, but there is no obvious terrain point in the direction of the direction of the movement, this method can be adopted.
How to draw a northern needle
The cad of the northern needle is strictly stipulated. The northern arrow is drawn in fine lines with a diameter of 24 mm.The tip of the pointer is north, which usually means "North" or "N". The width of the rear of the pointer should be 3mm.If you need to draw a large diameter compass, the tail of the pointer should be 1/8 of the diameter.
maintenance of the northern needle
Do not close to the ferromagnetic substance when placing the northern needle to avoid losing magnetism; do not knock the northern needle with a measurement ruler to avoid affecting the measurement of the measurement; do not twist the reflector, so as not to affect the aiming and read scores;Do not wipe it with dirty cloth and hand; should be closed when the instrument is not used, put it in the box, be careful not to collide.
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