map colors black -cultural man made features (bldgs, roads, elevations, all labels) blue...
TRANSCRIPT
Black - cultural man made features (bldgs, roads, elevations, all labels)
Blue - hydrography or water features (stream, river, lake, swamp, etc)
Green - vegetation w/ military significance (woods, orchards, vineyards, etc)
Red /Brown - combined to ID cultural features, all relief features, elevation, and contour lines (used on newer red light readable maps)
100Meter
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6 Digit Grid – within 100 m
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100Meter
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6 Digit Grid – within 100 m
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8 Digit Grid – within 10 m
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8 Digit Grid – within 10 m
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FT 0355----
8 Digit Grid – within 10 m
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(1:50,000 scale Tenino map)
1) Find an 8 digit grid for Crawford Mountain Lookout Tower (vic EG 1887). Answer: EG 18058758
3) What structure is located at EH 06900250? Answer: Abandoned Machine Gun Bunker
Railroad Bridge
Practical Exercise
2) Find an 8 digit grid for the Zion Chapel (vic EH 1102). Answer: EH 11300291
4) What structure is located at EG 10549310? Answer:
5) What is the terrain/vegetation like vicinity of EG 083955? Answer: Marsh / swamp
1) What is the straight line distance (in meters) between the Olympia Municipal Airport Beacon (EH 07780249) and the horizontal control station located at EG 05489809? Answer: 4,970 m
4) What is the road distance in meters from EG 10759700 to EH 08950100? Answer: 5,150 m (approx)
Practical Exercise – Horizontal Distance
2) What is the straight line distance (in meters) between the chimney located at EG 10957786 and the water tower located at EG 09948210? Answer: 4,360 m
3) What is the straight line distance (in meters) between Violet Prairie Church (vic EG 0687) and the water tower located vic EG 1088? Answer:
4,390 m
1) What is the vertical height (in meters) at EG 12758880? Answer: 120 m
Practical Exercise – Vertical Distance
2) What is the change in vertical distance from EG 14908436 to EG 14758585? Answer: 220 m ; (360m – 140m)
3) What is the estimated maximum elevation of the hilltop located at EG 171844? Answer: 310 m
1) What is the back azimuth of 71 degrees?
Answer: 251 degrees
3) What is the Grid Azimuth from the TV Relay Tower (EG 12568775) and the water tower near Forest Cemetary (EG 11508558)?
Answer: 206 degrees
Practical Exercise
2) What is the back azimuth of 287 degrees?
Answer: 107 degrees
MN
X
X = GM Angle
Magnetic to Grid (M G): Add
Easterly Rules
Grid to Magnetic (G M): Subtract
X
MN
Magnetic to Grid (M G): Subtract
Westerly Rules
Grid to Magnetic (G M): Add
X = GM Angle
Convert the following from grid azimuth to magnetic azimuth.
1) Grid Az – 131, G-M Angle – 13 east, Mag Az –
2) Grid Az – 299, G-M Angle – 11 west, Mag Az –
3) Grid Az – 035, G-M Angle – 04 west, Mag Az –
Practical Exercise
118 degrees mag
310 degrees mag
039 degrees mag
Convert the following from magnetic azimuth to grid azimuth.
1) Mag Az – 008, G-M Angle – 09 east, Grid Az –
2) Mag Az – 213, G-M Angle – 18 east, Grid Az –
3) Mag Az – 077, G-M Angle – 21 west, Grid Az –
017 degrees grid
231 degrees grid
056 degrees grid
% slope = Vertical Distance (VD) x 100 Horizontal Distance (HD)
b
a
VD = Elevation at b – Elevation at a
HD = Straight line distance between a & b
VD
Percent Slope
HD
Degree slope = Vertical Distance (VD) x 57.3 Horizontal Distance (HD)
b
a
VD = Elevation at b – Elevation at a
HD = Straight line distance between a & b
VD
Degree Slope
HD
We have two OPs located in front of our defensive position. Both OPs can see enemy activity. From OP1, the enemy activity is 32-degrees magnetic and from OP2, it is 322 degrees magnetic. The G-M angle is 18-degrees easterly. The magnetic azimuth from OP1 is 32 degrees. Convert this to a grid azimuth by adding the 18-degree G-M angle. The grid azimuth would be 50 degrees. Using the protractor, plot this azimuth on the map. Convert the 322-degree magnetic azimuth to a grid azimuth. the grid azimuth is 340 degrees. Using the protractor, plot this azimuth. The enemy is located where the line cross.
Intersection
Step 2:-Convert azimuth from magnetic to grid
G-M Angle: 18 east
OP1: 032 magnetic
032+18 = 050 grid
OP2: 322 magnetic
322+18 = 140 grid
Step 1:-Identify / plot OPs or points of reference
Step 3:- Plot first azimuth (050 degrees grid)
Step 4:- Plot second azimuth (240 degrees grid)
Bad GuysBad GuysStep 3:- Plot first azimuth (050 degrees grid)
Step 4:- Plot second azimuth (240 degrees grid)
Step 5:- Plot intersection
Bye ByeBye ByeStep 3:- Plot first azimuth (050 degrees grid)
Step 4:- Plot second azimuth (240 degrees grid)
Step 5:- Plot intersection
Step 6:- Kill Bad Guys
Resection
Looking out from our position we can see a bridge. We determine the magnetic azimuth to its location to be 159 degrees.
For the purpose of this problem, assume that there is a 1-degree westerly G-M angle.
Convert from magnetic giving you a grid azimuth of 158 degrees.
Next, we must convert this grid azimuth to a BACK azimuth by ADDING 180 degrees and plot the back azimuth of 338 degrees from the bridge. Our location is somewhere along this line.
From our location, we can also see a larger road intersection. the road intersection is on a magnetic azimuth of 117 degrees. The grid azimuth is 116 degrees. Back Azimuth of 296 degrees g.
The back azimuth of 296 degrees is plotted from the road intersection. Your location is where the lines cross.
Step 2:-Convert azimuth from magnetic to grid
G-M Angle: 01 west
Bridge: 159 magnetic
159 - 1 = 158 grid
Road Int: 117 magnetic
117 - 1 = 116 grid
Step 1:-Identify / plot OPs or points of reference
Step 3:-Convert azimuth to back azimuth
G-M Angle: 01 west
Bridge: 158 grid from you
Back Az: 158 + 180 = 338
Road Int: 116 grid from you
Back Az: 116 + 180 = 296
Step 4:- Plot first back azimuth from landmark (bridge) Step 5:- Plot second back azimuth from landmark (road intersection)
XX
Step 4:- Plot first back azimuth from landmark (bridge) Step 5:- Plot second back azimuth from landmark (road intersection) Step 6:- Plot your position
XX
Step 4:- Plot first back azimuth from landmark (bridge) Step 5:- Plot second back azimuth from landmark (road intersection) Step 6:- Plot your position
Step 7:- Move out to chow
Modified Resection
Looking out from our position along Steam Mill Road, we can see the top of Hill 445 to our NW. We determine the magnetic azimuth to its location to be 299 degrees.
For the purpose of this problem, assume that there is a 18-degree easterly G-M angle.
Convert from magnetic giving you a grid azimuth of 317 degrees. Convert and plot the back azimuth of 137 degrees.
Our location along Steam Mill Road is where this line crosses the road.
Step 2:- Convert azimuth from magnetic to grid
G-M Angle: 18 east
OP1: 299 magnetic
299+18 = 317 grid
Step 1:-Identify / plot OPs or points of reference
Step 3:- Convert azimuth to back azimuth
Hill 445: 317 grid from you
Back Az: 317 - 180 = 137
XX
Step 4:- Plot back azimuth from landmark (Hill 445)
Step 5:- Plot your position where the line intersects the road you are on
Step 6:- Drive on airborne, START WALKING!!
Solve the following problem by intersection. You receive radio calls from both OP1 and OP2. Each report enemy activity to their south. Both report approx 5 dismounted troops and one vehicle. You believe they are looking at the same enemy unit. If you can determine their location, you can destroy them with artillery fires. OP1, located atop Hill 210 vic EG1290, reports the enemy to be at 100 degrees magnetic from his location. OP2, located atop Hill 222 vic EG1690, reports the enemy to be at 168 degrees magnetic from his location. What is the 8 digit grid to the enemy?
Answer -
Practical Exercise - Intersection
EG16238850
Example:
9
Easterly RulesMagnetic to Grid (M G): Add
000 G009 G or 000 M
216 mag + 9 = 225 grid
9
216 M
225 G
Mag Az = 216GM Angle = 9 east
Example:
Grid Az = 026GM Angle = 17 east
Easterly Rules
000 G
026 grid - 17 = 9 grid
Grid to Magnetic (G M): Subtract
017 G or 000 M
026 G or 009 M
917
Example:
Mag Az = 286GM Angle = 17 west
Westerly RulesMagnetic to Grid (M G): Subtract
286 mag - 17 = 269 grid
000 G
286 M or 269 G
17
Westerly RulesGrid to Magnetic (G M): Add
000 G
12
112 G or 124 M
Example:
Grid Az = 112GM Angle = 12 west
112 grid + 12 = 124 mag
Terrain Features
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