Instruction Manual for the GLP-1 Pocket Compass

Release Date:

2021-06-22

I. Uses
GLP-1 The type geological compass is By the azimuth measurement mechanism and The pitch angle measurement mechanism consists of components that can determine the azimuth, Map calibration, distance measurement, measurement Pitch angle and the ability to draw simple maps, among other functions.
Instrument It is coated with luminous markings for use during nighttime operations.
II. Structure and Performance

1. Azimuth measurement mechanism:
by Magnetic needle box ,方位 Plate, It consists of the rear sight and front sight. The outer ring of the azimuth scale is 360° Division system, minimum scale value 2° ; the inner circle is 60-00 Mil-based division system, minimum scale value 0-20 Mil.

Measurement accuracy: ±1° ， ±0-10 Mil angular unit 。
    2. Pitch angle measurement mechanism:
     by Angle plate 、 Protractor 、 Reflective consisting of a mirror and other components, with a measurement range of ±90° , minimum grid value 5 °.
     Measurement accuracy ： ±2.5 °
III. Usage Method
    1. Measure the azimuth ：
     Expand Instrument , rotate the orientation frame ， Make the (on the directional glass N ) Align the character with the direction indicator, and support it evenly with the left hand. Instrument , will Reflective Mirror placed at an angle ( 45° ) Aim at the target with one eye through the rear sight and front sight, from Reflective Mirror reflection shows the magnetic needle. N The ultimate to point Azimuth division allows the target azimuth angle to be read. Also possible Rotate the azimuth frame with your right hand so that the azimuth glass on ( N ) Characters and the Magnetic Needle N Extreme alignment, Through Orientation glass ( N ) character Simply follow the indicator line for an accurate reading. Target azimuth.
    2. Calibration Map:
     Expand Instrument , rotate the azimuth frame to align the azimuth glass on the ( N ) Character and direction indicator pair Correct , will Instrument Place it flat on the map, with the sight’s end pointing toward the map’s North Pole, so that Instrument side Tangent to the map’s magnetic meridian; rotate the map so that the magnetic needle N On the glass at the extreme alignment position ( N ) At this point, the map has already been calibrated.
    3. Moving Toward the Goal:
     Expand Instrument in Calibrated On the map, make Instrument side Based on my vantage point on the map and Action Enter The target—at this point, the direction indicator shows the intended direction of travel. Rotate the azimuth frame so that the azimuth glass displays ( N ) and Magnetic needle of ( N ) The directions are aligned; at this point, aim forward through the front and rear sights. Aim Accurate, here Aim All objects along the reference line (such as forests, houses, etc.) can serve as landmarks. Enter Auxiliary targets in the direction; once the auxiliary target is identified, you can then engage it. Previous Enter. Will Instrument Close packaging Enter Inside the bag, but do not rotate the orientation frame; upon reaching the auxiliary target, Rotate the instrument so that the magnetic needle of ( N ) and On the directional glass ( N ) Align and aim ahead, Then identify another auxiliary waypoint and proceed toward it, continuing in this manner until you reach your destination, while regularly checking your bearing along the way.
    4. Determining the distance to the target using auxiliary points
     Aim at the target using the front and rear sights, then rotate the azimuth dial to ( N ) Character alignment with the magnetic needle N extreme ， Make a note Objective the azimuth (Mil) Take a bearing. Then turn left or right by a right angle (i.e., the difference from the original bearing is 15-00 ) Locate an auxiliary point, and use pacing or another method to measure the distance from the auxiliary point to the standing point. At the auxiliary point, again use Instrument Align the front and rear sights with the original target, and note it. The azimuth of the target at this moment Read the value. Based on the two measurements, before and after. position The difference in angle readings and the distance from the station to the auxiliary point, refer to the supplementary table. One The target distance can be obtained.
    5. Measure pitch angle:
     to put Instrument side-up ， Turn the rearview mirror to 45 °, Aim at the target using the front and rear sights, by Reflective mirror Read Read the pitch angle, or place the reference surface against a plane and measure the angle of inclination of that plane.

IV. Maintenance and Upkeep
    1. Use and Placement Instrument Avoid placing the compass near ferromagnetic objects, high-voltage power lines, and electromagnetic devices to prevent measurement errors and reduced compass sensitivity.
    2. When not in use, store in a well-ventilated, dry place to prevent mold.
    3. When any surface becomes stained or soiled, gently wipe it with a white velvet cloth to maintain its smooth, glossy finish.

Magnetic Declination in Major and Medium-Sized Cities of China (2018)
Serial Number	Region	Magnetic Declination D
1	Beijing	6°52ʹ	(W)
2	Shanghai	5°57ʹ	(W)
3	Tianjin	6°55ʹ	(W)
4	Chongqing	2°27ʹ	(W)
5	Anshan	8°49ʹ	(W)
6	Baotou	4°51ʹ	(W)
7	Changchun	10°1′	(W)
8	Changsha	3°38ʹ	(W)
9	Chengdu	2 degrees and 2 minutes	(W)
10	Dalian	7°58ʹ	(W)
11	Fangchenggang	1°53ʹ	(W)
12	Fushun	9°12ʹ	(W)
13	Fuzhou	4°24ʹ	(W)
14	Guangzhou	2°50ʹ	(W)
15	Guiyang	2°10ʹ	(W)
16	Hangzhou	5°30ʹ	(W)
17	Harbin	10°45ʹ	(W)
18	Hefei	5°18ʹ	(W)
19	Hohhot	5°31ʹ	(W)
20	Jilin City	10°11ʹ	(W)
21	Jinan	6°17ʹ	(W)
22	Urumqi	2°52ʹ	(E)
23	Lhasa	0°8ʹ	(E)
24	Kashgar	3°59ʹ	(E)
25	Kunming	1 degree 23 minutes	(W)
26	Lanzhou	2°19ʹ	(W)
27	Luoyang	4°39ʹ	(W)
28	Nanchang	4°21ʹ	(W)
29	Nanjing	5°39ʹ	(W)
30	Qingdao	6°59ʹ	(W)
31	Qiqihar	10°45ʹ	(W)
32	Shenyang	9 degrees 5 minutes	(W)
33	Shijiazhuang	5°56ʹ	(W)
34	Taiyuan	5°17ʹ	(W)
35	Tangshan	7°18ʹ	(W)
36	Wuhan	4°22ʹ	(W)
37	Xi'an	3°37ʹ	(W)
38	Xining	1°49ʹ	(W)
39	Yinchuan	3°20ʹ	(W)
40	Zhengzhou	5°0ʹ	(W)
41	Kowloon, Hong Kong	2°52ʹ	(W)
42	Victoria Harbour, Hong Kong	2°50ʹ	(W)
43	Macao	2°44ʹ	(W)