In gunnery the unit of angular measurement is the mil. The mil is equal to 1/6400 of a circle (NATO; 1/6000 - ex-USSR). Mils facilitate easy and rapid conversion from angular units to linear, and vice versa, since the arc length corresponding to one mil equals one thousandth of the radius (distance to the target) at all distances. For example, at a distance of 500 m one mil equals 0.5 m, at 1 km - 1 m, 1.5 km - 1.5 m, etc. Knowing the size of the target and its visual angle, it is possible to determine the range to the target, or knowing the range and size, to determine the visual angle of the target, etc.

Code:
    H * 1000
D = --------
       A
where: D - range to the target in meters, A - scope size of the target in mils, H - height (width) of the target in meters.

In ex-USSR angles in mils are usually written in two groups: first group - hundreds of mils, the second - tens and ones. E.g., 1 mil is 0-01, 100 mils is 1-00, etc.



Example

Enemy tank, width 3.5 m, visible at angle about 0-04. Determine the distance.



Solution:

Code:
    H * 1000   3.5 * 1000
D = -------- = ---------- = 875 m.
       A            4

Reticles subtensions

T-62

Binocular


Commander's vision device TKN-3


Telescope sight TSh2B-41


Night sight TPN-1-41-11


Collimator sight K10-T (DShK)


M60

Binocular


Periscope nonballistic reticle M32


Telescope ballistic reticle M105D


Machinegun sight M28C (M85)


Range estimation tables

Code:
Mils              10       9       8       7       6       5       4       3       2       1
--------------------------------------------------------------------------------------------
T-62, T-55, BRDM-2, GAZ-66, M113A1//////////////////////////////////////////////////////////
Height 2,4 m     250     250     300     350     400     500     600     800    1200    2400
BMP-1, BTR-60///////////////////////////////////////////////////////////////////////////////
Height 2,2 m     200     250     300     300     350     450     550     750    1100    2200
M60A1///////////////////////////////////////////////////////////////////////////////////////
Height 3,2 m     300     350     400     450     550     650     800    1050    1600    3200
Chieftain Mk.5//////////////////////////////////////////////////////////////////////////////
Height 2,6 m     250     300     350     350     450     500     650     850    1300    2600
Olifant Mk IA///////////////////////////////////////////////////////////////////////////////
Height 3,6 m     350     400     450     500     600     700     900    1200    1800    3600
Ratel///////////////////////////////////////////////////////////////////////////////////////
Height 2,9 m     300     300     350     400     500     600     750     950    1450    2900
Man-sized target////////////////////////////////////////////////////////////////////////////
Height 1,7 m     150     200     200     250     300     350     450     550     850    1700
Single storey house/////////////////////////////////////////////////////////////////////////
Height 4,5 m     450     500     550     650     750     900    1150    1500    2250    4500
Telegraph post//////////////////////////////////////////////////////////////////////////////
Height 6 m       600     650     750     850    1000    1200    1500    2000    3000    6000


Code:
Mils              10       9       8       7       6       5       4       3       2       1
--------------------------------------------------------------------------------------------
T-62, T-55//////////////////////////////////////////////////////////////////////////////////
Length 6,6 m     650     750     850     950    1100    1300    1650    2200    3300    6600
Width 3,3 m      350     350     400     450     550     650     850    1100    1650    3300
BMP-1///////////////////////////////////////////////////////////////////////////////////////
Length 6,7 m     650     750     850     950    1100    1350    1700    2250    3350    6700
Width 2,9 m      300     300     350     400     500     600     750     950    1450    2900
BTR-60//////////////////////////////////////////////////////////////////////////////////////
Length 7,6 m     750     850     950    1100    1250    1500    1900    2550    3800    7600
Width 2,8 m      300     300     350     400     450     550     700     950    1400    2800
BRDM-2, GAZ-66//////////////////////////////////////////////////////////////////////////////
Length 5,8 m     600     650     750     850     950    1150    1450    1950    2900    5800
Width 2,4 m      250     250     300     350     400     500     600     800    1200    2400
M60A1, Chieftain Mk.5, Olifant Mk IA////////////////////////////////////////////////////////
Length 7,5 m     750     850     950    1050    1250    1500    1900    2500    3750    7500
Width 3,5 m      350     400     450     500     600     700     900    1150    1750    3500
M113A1//////////////////////////////////////////////////////////////////////////////////////
Length 4,9 m     500     550     600     700     800    1000    1250    1650    2450    4900
Width 2,7 m      250     300     350     400     450     550     700     900    1350    2700
Ratel///////////////////////////////////////////////////////////////////////////////////////
Length 7,2 m     700     800     900    1050    1200    1450    1800    2400    3600    7200
Width 2,5 m      250     300     300     350     400     500     650     850    1250    2500

Last edited by Krabb; 11/30/12 04:43 PM.