Open small sight and large sight as far as possible. Flip peep sight up on large sight,. It would be necessary to construct a map of your claim, and tie locate your claim relative to some known position. Your Brunton Pocket Transit is ideally suited for this job, since it is essentially the same instrument used by geologists, mining engineers for each azimuth. Following, is general information on mining claims for basic understanding.
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Permanently magnetized and suspended on a bearing mount. Outlined orienting arrow is adjustable eastward or westward for declination correction by rotating the clear vial independently from the white azimuth ring. Declination scale: Printed inside azimuth ring, degrees marked every two degrees, East and West declination. Vial: Clear liquid filled plastic vial that surrounds magnetized needle.
The liquid inside is used to slow and stabilize the movement of the magnetized needle. Map Scales: Black imprinted scales on base plate used to determine distance on maps. Refer to maps margins for scale information. USGS 7. Sighting Systems: Directional, and Mirrored.
Figure 2B 3. Do not point the compass with your hand. Pocket Turn your whole body. Figure 3C Look up, sight a landmark rock, tree, etc. Take care not to mis-align the Magnetic Needle. Keep it centered inside the Orienting Arrow. Now walk towards the landmark. Repeat this procedure until you reach your destination. Figure 3D When you repeat this process, identify landmarks along your bearing path the further away the better and walk to them.
You can navigate around difficult terrain such as streams and cliffs, while still maintaining your original bearing. If you are using a Brunton compass that has a Sighting Mirror, adjust the mirror so that it reflects the entire compass dial as you look across the Base Plate. Object or direction is sighted through "gun" sights while needle alignment and azimuth ring are read in reflection of mirror.
Your Bearing will be read at the Index line "gun" sight next to the mirror hinge. Follow your Bearing as indicated above. Using a Topographical Map Topographical maps present a 3 dimensional picture of the land viewed from above. Features are designated by color and symbol: Cultural features or man-made Black , water Blue , vegetation Green , and elevation Brown.
Elevation is indicated by contour lines, on which every point along the ground is at the same height above sea level. The closer the contour lines, the steeper the slope.
Every fifth line is darker and has a number representing the height above sea level. Contour lines also show the shape and form of the land. Maps are made to a scale, which represents a proportion to the distance between points on the map and the actual distance between the same points on the ground. Large scale maps, such as a , U. The legend at the base of the map indicates the scale, contour interval and special symbols shown. Figure 4 5.
Understanding Declination Declination or variation is the difference between True North to which maps are drawn and Magnetic North as indicated by a compass. You Must adjust for declination, East or West, when using a compass with a map. Declination varies throughout the world and is shown on topographical maps with a diagram, identifying Magnetic North MN and the degree variance from True North TN.
Magnetic fields fluctuate slowly at varying rates around the world. It is best to use an up to date map for current declination.
Visit our web sight or call Brunton for an accurate declination variance in a specific location. Figure 5 Figure 2A 6. Adjusting Compass for Declination Identify the declination variance from your map.
Grasp inside vial orienting arrow separately from white azimuth ring. Rotate vial until the orienting arrow is pointing to the desired degree of declination on the declination scale, East or West. Figure 6 After you have adjusted your compass for declination, the magnetized needle still points towards magnetic north. The white azimuth ring and bearings sighted with the Figure 3A compass now represent True North bearings. Read Bearing Here.
Brunton Transit Instruction Manual
Do not point the compass with your hand. Turn your whole body. Figure 3C Look up, sight a landmark rock, tree, etc. Take care not to mis-align the Magnetic Needle. Keep it centered inside the Orienting Arrow. Now walk towards the landmark. Repeat this procedure until you reach your destination.
Brunton TruArc User Manual