TACT 3005

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• TACT 3005
• LAND NAV I
• (LENSATIC COMPASS)

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-Lensatic Compass -Systems of Measurement -Pace
Counts -Map Orientation
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LENSATIC COMPASS
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LENSATIC COMPASS
EYEPIECE
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• SYSTEMS OF MEASUREMENT

For military use, direction is expressed as units
of angular measure from a Base Line. There are
two systems of measurement used by the military
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• The most common measure is
• DEGREES

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• Another less used system of measure is
• MILS

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BASELINES
The three types of north are the baselines when
measuring angles.
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THE THREE BASIC DIRECTIONS ARE
1. TRUE NORTH- Direction to the geographic north
pole. 2. MAGNETIC NORTH- Established by
earths magnetic fields.our compass arrows. 3.
GRID NORTH- Established by north and south grid
lines on a map.
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• An azimuth is defined as a horizontal angle,
  measured in a clockwise manner from a north
  baseline.

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• When you have turned around completely, you have
  achieved your back azimuth.

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• LAMS

To help figure out your back azimuth use this
simple method

• LESS THAN 180 ADD
• MORE THAN 180 SUBTRACT

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How to take and follow an azimuth

• SIGHTING METHOD
• (compass to cheek)

2. CENTER HOLD METHOD
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SIGHTING METHOD
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Compass to Cheek (Sighting) Method
-Prep Compass -Body Positioning/Control -Read
Compass (Shoot at least two (2)
azimuths!!!) -Reference Points
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CENTER HOLD METHOD
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Center-Hold Method
-Prep Compass -Body Positioning/Control -Read
Compass (Shoot at least two (2)
azimuths!!!) -Quicker, easier, but not as
accurate -Great for limited vis.
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HEAD BREAK!!!
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CARE OF THE COMPASS
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COMPASS INSPECTION
INSPECTION Look over the compass MOST
IMPORTANT.. Make sure the compass
dial does not
stick!!!
ACCURACY 3 degrees or
PROTECTION Handle compasses carefully.
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• COMPASS
• HANDLING

• Handle with care.
• Close and return the compass to its container
  when not in use!!!
• Attach a string or lanyard.

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To avoid interference with compass readings,
keep your compass the following distances away
from certain items you might be around
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1. Metal helmet or rifle?
2. Machine gun?
3. Telephone wires and barbed wire?
4. Field guns and tanks?
5. Power lines?
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PACE COUNTS
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A pace is equal to 2 steps or approximately 60
inches.
REMEMBER Every person has a different length
of natural pace
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Pace counts are usually done with a distance of
200 meters. Divide the total number of paces by
2. This gives you how many paces you take for
100 meters.
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SLOPES - Pace is lengthened on the downgrade
and shortened on the upgrade.
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WINDS- Headwinds shorten pace, and tailwinds
increase the pace.
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SURFACES- Sand, gravel, mud, etc., all tend
to shorten the pace.
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ELEMENTS- Rain, snow, and sleet shorten
the pace.
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Excessive clothing and fatigue tend shorten the
pace.
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Orienting the Map
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• Orientation by Inspection

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Orientation by compass
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• Place map on flat surface.
• 2. Place straight edge of compass on any
  north-south grid line.
• 3. Rotate map and compass until north arrow
• and black index line form the same v-shaped
  angle like the declination diagram.
• IMPORTANT!!!!!
• Degree reading is under the black line.

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Questions For Me???