117 - Land Navigation Flashcards
12 parts of lensatic compass
Luminous sighting dots
Short luminous line
Luminous magnetic arrow
Fixed index line
Graduated straight edge
Lens
Floating dial
Bezel ring
Thumb loop
Sighting wire
Sighting slot
Lens or rear sight
Major parts of lensatic compass
Cover
Base
Lens
Compass cover
Protects floating dial
Contains sighting wire (front sight) and two luminous sighting slots or dots for night nav
Compass base
Contains floating dial on mounted pivot encased in glass with a fixed black index line
Bezel ring clicks when turned, each is 3* (#120), has a short luminous line
Thumb loop attached
Compass lens
Used to read the dial, has rear-sight slot for sighting on objects and lock/clamps dial when closed
Rear sight must be open more than 45* to allow dial to float freely
How to locate a coordinate on a map
Right then up
Map feature: red
Cultural man made features: populated areas, main roads, boundaries on older maps
Map feature: blue
Water features
Map feature: black
Cultural manmade, like buildings and roads, surveyed spot elevations, all labels
Map feature: brown
Relief features and elevation, contours on older edition maps, and cultivated land on red-light readable maps
Map feature: red brown
Combined on red-light readable maps to identify cultural features, all relief features, non-surveyed spot elevations, contour lines
Map feature: green
Vegetation with military significance like woods, orchards, vineyards
Ridgeline
Line- line of high ground with low on all sides
Hill
Sides slope down on all sides, indicated by concentric circles
Saddle
Dip between two areas of higher ground, indicated by hourglass
