Map Reading IIMap Reading IIIReading a Grid &Determining DirectionGRC JROTCCOL. ALEXANDER

Map Reading III

Map Reading IIIOutlinePurposeNorth (3 types)Types of AzimuthsMeasuring AzimuthsPlotting Azimuths Practical ExerciseSummaryConclusion

Map Reading III

Map Reading IIIPurposeTo lay the groundwork for successful map reading and land navigation by exposing the cadet to determining grid and magnetic azimuths using a protractor and compass.

Map Reading III

Map Reading IIINorth (x3 types)True North- line through North Pole.

Magnetic North- direction to northern magnetic pole (compass).

Grid North-North as established by map maker.TrueNorthMagneticNorthGridNorth

Map Reading III

Map Reading IIITypes of AzimuthAn azimuth is an angle measuredclockwise from a base line direction (north).

Grid- angle between grid north and a straight line plotted between two points on a map.Magnetic- angle determined by using a compass.Back- opposite direction of an azimuth.

Map Reading III

Map Reading IIIMeasuring an Azimuth Protractors

CompassesEWSN360 degrees in a CIRCLE

Map Reading III

Map Reading IIIMeasuring an Azimuth Protractors

Map Reading III

Map Reading IIIMeasuring an AzimuthCompassesMagnetic Lensatic Compass(Military Type)

Silva Polaris Compass(Civilian Orienteering)

Map Reading III

Map Reading III3 Ways to Plot AzimuthsPlotting Azimuths between 2 points on a map.Converting Magnetic Azimuths to Grid Azimuths.Converting Grid Azimuths to Magnetic Azimuths.

Map Reading III

Map Reading IIIReading a GRID10-DIGIT GRID:EG 1 2 3 4 5 6 7 8 9 108-DIGIT GRID:EG 1 2 3 4 5 6 7 81000M 100M 10M 1M 1000M 100M 10M 1M1000M 100M 10M 1000M 100M 10M

Map Reading III

Map Reading IIIReading a GRIDCOLUMBUS: 16SFL (or GL)08 45 74 25

TENINO: 10TEH (or EG)15 85 82 20Square Identification8-DigitGrid(w/in 10 M)08 74 (4 digit)084 742 (6 digit)

Map Reading III

Map Reading IIIReading a GRID757527271. Read RIGHT2. Then UP767628281000

METERS1000 METERS

Map Reading III

Map Reading IIIUsing a ProtractorMAKE SURETHAT YOUUSE THECORRECTSCALE for the MAP you have

1:50,000

Map Reading III

Map Reading IIIUsing & Reading a Protractor1 GRID SQUARE = 1000 M x 1000 MEach # (1, 2, 3, etc) = 100 METERS

Each | in between =50 METERS25 or250 M

Map Reading III

Map Reading IIIReading a Protractor080808 45 74 25747409097575Line-UpVertical Scale of protractor with 08 GridRIGHTUPSlide protractor over to the RIGHT - 45Move UP 25 & place a dot or markUse Protractor

Map Reading III

Map Reading IIICAUTION: You cant put your pen/marker thru the plastic edge/overhang !MUST slide protractor to the RIGHT to place markMUST BE PRECISE

Map Reading III

STEP 1. Locate 2 points: POS 1- EG1350 8009 and POS 2- EG1610 8055 on the map..50TENINO Map SheetPoint #180.09131. Read RIGHT

STEP 1. Locate two points: POS 1- EG13508009 and POS 2- EG1610 8055 on the map.TENINO Map Sheet; Point #280.10.551. Read RIGHT

STEP 2. Connect the points with a straight edge. Draw a line extending beyond the points. POS 2Use a STRAIGHT EDGE

POS 2STEP 3. Place index of protractor on line at a vertical (North/South) or horizontal (East/West) grid line. Keep the 0-180 degree line on the vertical grid line.

STEP 4. Read the angle value on the grid scale.POS 280 degrees1420 mils

Map Reading IIIRULE #1: IF THE AZIMUTH IS MORE THAN 180 DEGREES, THEN SUBTRACT 180 DEGREES.EXAMPLE: AZIMUTH 215 DEGREES-180 DEGREESBACK AZIMUTH 35 DEGREESRULE #2: IF THE AZIMUTH IS 180 DEGREES OR LESS, THEN ADD 180 DEGREES.EXAMPLE: AZIMUTH 180 DEGREES+180 DEGREESBACK AZIMUTH360 DEGREESBACK AZIMUTH

Map Reading III

Map Reading III3 Ways to Plot AzimuthsPlotting Azimuths between 2 points on a map.Converting Magnetic Azimuths to Grid Azimuths.Converting Grid Azimuths to Magnetic Azimuths.

Map Reading III

Map Reading IIIPlotting AzimuthsAzimuths must be converted to the environment they will be used in.Grid to Magnetic (map-to-compass)Magnetic to Grid (compass-to-map).Use the Declination Diagram to find the conversion angle (GM Angle).

For Grid to Magnetic Conversion Remember: Right-Add-Left-Subtract (RALS):GM to the Right Add GM.GM to the Left Subtract the GM.

Map Reading III

Map Reading IIIPlotting Azimuths; Declination DiagramsWhat is the GM Angle for Tenino?What is the GM Angle for Columbus?

Map Reading III

Map Reading IIIPractical ExerciseQuestion #1:Given a Tenino Map (hint: find Declination Diagram).

From your location you see a radio tower on magnetic azimuth of 275 degrees.

What azimuth will you use to locate the radio tower on your map?

Bonus: What would be the GRID azimuth from the tower to your position?

Map Reading III

Map Reading IIIMAGNETIC AZIMUTH: 275 DEGREESWESTERLY G-M ANGLE: + 21 DEGREESGRID AZIMUTH: 296 DEGREESAnswer: # 1BONUS:GRID AZIMUTH: 296 DEGREESOPPOSITE DIRECTION:- 180 DEGREESBACK AZIMUTH: 116 DEGREES

Map Reading III

Map Reading IIIPractical ExerciseQuestion #2Given a Tenino Map (hint: find Declination Diagram).

After determining the map location for your rendezvous with the B Company platoon leader, you plotted the grid azimuth at 179 degrees. There are mine fields on both sides of your route so you want to make sure you travel in the right direction.

What azimuth will you tell your compass man to follow?

Bonus: You got half way to the rendezvous and were directed to dispatch a squad back to your original location.

What azimuth should your squad leader follow?

Map Reading III

Map Reading IIIGRID AZIMUTH: 179 DEGREESEASTERLY G-M ANGLE: -21 DEGREESMAGNETIC AZIMUTH:158 DEGREESAnswer: # 2BONUS:MAGNETIC AZIMUTH:158 DEGREESOPPOSITE DIRECTION: +180 DEGREESBACK AZIMUTH: 338 DEGREES

Map Reading III

Map Reading IIIPractical ExerciseQuestion #3 (TENINO Map)What TERRAIN FEATURE is located at EG 06159015?

What TERRAIN FEATURE is located at EG 12859835?

What TERRAIN FEATURE is located at EG 10309650?

What TERRAIN FEATURE is located at EG14508545?

What TERRAIN FEATURE is located at EG 02407981?

What TERRAIN FEATURE is located at EG 15329335?

What TERRAIN FEATURE is located at EH 18700030?

Map Reading III

Map Reading IIIAnswer: PE # 3 What TERRAIN FEATURE is located at EG 06159015? - DEPRESSION

What TERRAIN FEATURE is located at EG 12859835? - SADDLE What TERRAIN FEATURE is located at EG 10309650? RIDGE

What TERRAIN FEATURE is located at EG14508545? CLIFF

What TERRAIN FEATURE is located at EG 02407981? - DRAW

What TERRAIN FEATURE is located at EG 15329335? - SPUR

What TERRAIN FEATURE is located at EH 18700030? - HILL

Map Reading III

Map Reading IIISummaryPurposeNorthTypes of AzimuthsMeasuring AzimuthsPlotting Azimuths Practical Exercise

Map Reading III

Map Reading IIIConclusionSuccessful land navigations starts with map reading skills. Your ability to swap information between grid a magnetic environments is essential to helping you fight, survive, and win on the battlefield.

Map Reading III

Map Reading IIMap Reading III Reading a Grid &Determining DirectionGRC JROTCCOL. ALEXANDER

Map Reading III