NavLab1

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Map Colors

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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)

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Major Terrain Features

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Hill

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Saddle

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Valley

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Ridge

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Depression

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Minor Terrain Features

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Draw

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Spur

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Cliff

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Supplementary Terrain Features

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Cut & Fill CUT FILL

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Military Grid Reference System

Slide18: 

VGT 20A 1000 Meter Grid Square

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VGT 21

Slide20: 

VGT 21 1000 Meters 1000 Meters

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90 03 FT0390 04 91 4 Digit Grid – within 1000m

Placement of Coordinate Scale on a Grid: 

Placement of Coordinate Scale on a Grid

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100 Meters 90 03 FT035906 04 91 6 Digit Grid – within 100 m 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 03 5

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100 Meters 90 03 FT035906 04 91 6 Digit Grid – within 100 m 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 90 6

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100 Meters 90 03 04 91 8 Digit Grid – within 10 m 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

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90 03 04 8 Digit Grid – within 10 m 1 2 3 4 5 6 7 8 9 1 2 3 5 6 1 2 3 4 5 6 7 8 9 FT 0355----

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8 Digit Grid – within 10 m FT 03559027 90 04 91 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

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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

Slide29: 

Measuring Distance

Contour Lines: 

Contour Lines

Graphic Scale: 

Graphic Scale Statute Miles Kilometers Nautical Miles

Straight Line Distance: 

Straight Line Distance

Curved Line Distance: 

Curved Line Distance

Slide34: 

Curved Line Distance

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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

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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

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Grid Azimuth

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VGT 28

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VGT 23

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VGT 30 A B

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VGT 31 A B

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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

Slide43: 

Your Magnetic Compass

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VGT 43

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VGT 44

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Compass to Cheek Method

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Centerhold Method

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Angle Conversion

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VGT 32 THREE NORTH'S TRUE NORTH MAGNETIC NORTH GRID NORTH G N N

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VGT 33

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MN X = GM Angle Easterly Rules

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MN Westerly Rules X = GM Angle

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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

Slide54: 

Slope

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% 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

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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

Slide57: 

Intersection

Slide58: 

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

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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

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Step 3: Plot first azimuth (050 degrees grid)

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Step 3: Plot first azimuth (050 degrees grid) Step 4: Plot second azimuth (240 degrees grid)

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Bad Guys Step 3: Plot first azimuth (050 degrees grid) Step 4: Plot second azimuth (240 degrees grid) Step 5: Plot intersection

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Bye Bye Step 3: Plot first azimuth (050 degrees grid) Step 4: Plot second azimuth (240 degrees grid) Step 5: Plot intersection Step 6: Kill Bad Guys

Slide64: 

Resection

Slide65: 

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.

Slide66: 

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

Slide67: 

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

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Step 4: Plot first back azimuth from landmark (bridge)

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Step 4: Plot first back azimuth from landmark (bridge) Step 5: Plot second back azimuth from landmark (road intersection)

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X Step 4: Plot first back azimuth from landmark (bridge) Step 5: Plot second back azimuth from landmark (road intersection) Step 6: Plot your position

Slide71: 

X 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

Slide72: 

Modified Resection

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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.

Slide74: 

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

Slide75: 

Step 4: Plot back azimuth from landmark (Hill 445)

Slide76: 

X 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!!

Slide77: 

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

Slide78: 

Questions?

Slide79: 

Example: 9 Easterly Rules Magnetic to Grid (M G): Add 000 G 009 G or 000 M 216 mag + 9 = 225 grid 9 216 M 225 G Mag Az = 216 GM Angle = 9 east

Slide80: 

Example: Grid Az = 026 GM 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 9 17

Slide81: 

Example: Mag Az = 286 GM Angle = 17 west Westerly Rules Magnetic to Grid (M G): Subtract 286 mag - 17 = 269 grid 000 G 286 M or 269 G 17

Slide82: 

Westerly Rules Grid to Magnetic (G M): Add 000 G 12 112 G or 124 M Example: Grid Az = 112 GM Angle = 12 west 112 grid + 12 = 124 mag

Terrain Features: 

Terrain Features 1)_____________ 2)_____________ 3)_____________ 4)_____________ 5)_____________ 6)_____________ 7)_____________ 8)_____________ 9)_____________ 10)_____________

Terrain Features: 

Terrain Features