Presentation on theme: "Map Reading Section 3 - B Continuation of Compass section."— Presentation transcript:
Map Reading Section 3 - B Continuation of Compass section
Finding your location Suppose you are lost and know that you are located someplace on this map You can see two mountains that show up on your map If you had the skill to measure the two lines as shown, you could find your location by the intersection of the two lines Let’s do it
Measure a Bearing Line up your compass with the red MN needle pointing towards the North sign on the compass Point the compass towards the top of the mountain Read the baring to the top of the mountain Do this for both mountains
138 + 180 =318 TB = MB + D MB = TB - D 318 + 10 =328 0 3600 360 180180 9090 270270 You now can draw your line
138 + 180 =318 TB = MB + D MB = TB - D 318 + 10 =328 196 + 180 =376 376 –360 = 16 16 + 10 = 26 Now do the other mountain
Additional Pointers Some compass's have a built in declination adjustment. You set the 10 o and the compass converts declination for you. Don’t forget to adjust this if you are not in CB. If using old maps, update the declination by using key words “magnetic declination “ on the internet. You must orient your map.
TN Orient the Map Once in the field you must orient the map. Place your compass on the map near the declination marking
TN MN Turn the map till the red line on your compass lines up with the grid on your map
TN MN The map is oriented with TN but if you don’t have declination built into your compass, you must turn the map more to line up with MN
TN MN Your map is now oriented You are ready to navigate
Traveling with a compass 1. Determine the bearing you will travel. 2. Select a landmark in the distance that lines up with the bearing. This can be a mountain, or in the dark it could be a partner with a light. 3. Travel towards the distant landmark … this prevents you from always looking at the compass. 4. Occasionally check the compass and select a new target when necessary. 4. When going around an obstacle (such as a pond or a hill) select a landmark on the other side. 5. Travel to the landmark and when you arrive select a new landmark as your target. 6. You can use time to measure the distance traveled … you can travel about 1 to 2 miles per hour on a trail but less than this if you are bushwhacking.
End of Compass Section Next section G. P. S. Global Positioning System