M2 Compass, Laying In A Mortar, And Declination Constant Flashcards
What are the 5 principal parts of the M2 compass
Compass body assembly, angle of sight mechanism, magnetic needle and lifting mechanism, as myth scale and adjuster, and front and rear sight.
What component of the M2 compass can be used as an alternate site for bore sighting
The angle of sight mechanism
What color is the North seeking arrow on the magnetic needle
White or a metallic color
How is the azimuth scale graduated on the M2 compass
From 0 to 6400 mils in 20 mil increments and numbered at 200 mil intervals
What part of the compass needle do you read to get the azimuth
South end of the needle
How do you level the M2 compass
The fish eye bubble
What is the elevation scale graduated in
0 to 1200 Mills
What is a Declination constant
The clockwise angle from grid to magnetic North
When do you declinate the aiming circle
- When they aiming circle has move 25 miles or more in the area which was last Declinated
- After an electrical storm or receiving a severe shock
- Every 30 days
What are the 2 ways to get a Declination constant
Map and Declination station
What’s the equation for reciprocal laying
Declination constant - mounting azimuth = the remainder
If the remainder and the being a negative number what must you add to the Declination constant
Add 6400 mils
What is a parallel sheaf
When the guns are laid in online the rounds land parallel to each other instead of all on the same point
What is sight block stake
When you lay in the gun on a 2800 mil deflection and minus of 1000 Mills from the deflection in place out site block stake
