www.SurvivalIQ.com  
  Home  Survival Skills  Land Navigation  Survival Fitness email us 
Contents

1. Training strategy
2. Maps
3. Marginal information and symbols
4. Grids
5. Scale and distance
6. Direction
  - Methods of expressing direction
  - Base lines
  - Azimuths
  - Grid azimuths
  - Protractor
  - Declination diagram
  - Intersection
  - Resection
  - Modified resection
  - Polar coordinates
7. Overlays
8. Aerial photographs
9. Navigation equipment and methods
10. Elevation and relief
11. Terrain association
12. Mounted land navigation
13. Navigation in different types of terrain
14. Unit sustainment

A. Field sketching
B. Map folding techniques
C. Units of measure and conversion factors
D. Joint operations graphics
E. Exportable training material
F. Orienteering
G. M2 compass
H. Additional aids
I. Foreign maps
J. Global positioning system
K. Precision lightweight global positioning system receiver

Survival Gear

Handheld GPS
Specialty Outdoor Gear
Digital Compasses
Survival Books
Hunting and Fishing Magazines

6-7. INTERSECTION

Intersection is the location of an unknown point by successively occupying at least two (preferably three) known positions on the ground and then map sighting on the unknown location. It is used to locate distant or inaccessible points or objects such as enemy targets and danger areas. There are two methods of intersection: the map and compass method and the straightedge method (Figures 6-16 and 6-17).

Figure 6-16. Intersection, using map and compass.

Figure 6-16. Intersection, using map and compass.

 

Figure 6-17. Intersection, using a straightedge.

Figure 6-17. Intersection, using a straightedge.

a.   When using the map and compass method—

(1)   Orient the map using the compass.

(2)   Locate and mark your position on the map,

(3)   Determine the magnetic azimuth to the unknown position using the compass.

(4)   Convert the magnetic azimuth to grid azimuth.

(5)   Draw a line on the map from your position on this grid azimuth.

(6)   Move to a second known point and repeat steps 1, 2, 3, 4, and 5.

(7)   The location of the unknown position is where the lines cross on the map. Determine the grid coordinates to the desired accuracy.

b.   The straight edge method is used when a compass is not available. When using it—

(1)   Orient the map on a flat surface by the terrain association method.

(2)   Locate and mark your position on the map.

(3)   Lay a straight edge on the map with one end at the userís position (A) as a pivot point; then, rotate the straightedge until the unkown point is sighted along the edge.

(4)   Draw a line along the straight edge

(5)   Repeat the above steps at position (B) and check for accuracy.

(6)   The intersection of the lines on the map is the location of the unknown point (C). Determine the grid coordinates to the desired accuracy (Figure 6-17).



Direction
Methods of expressing direction | Base lines | Azimuths | Grid azimuths | Protractor | Declination diagram | Intersection | Resection | Modified resection | Polar coordinates |




Buy The Book This Site Is Based On
The 'Land Navigation' section of this site is based on 'Map Reading and Land Navigation', a public domain work published by the U.S. Department of Defense that is available for sale at Amazon.com.




Copyright © 2008 SurvivalIQ.com. All Rights Reserved.

Disclaimers  |  Contact Us   |   Privacy