USER GUIDE

VBS3Fires Scenario Design

414

VBS3Fires v3.6.3 User Guide

6. Reported errors. All guns can have estimated errors in the muzzle velocity, orientation, and

elevation of the guns. Each of these errors is a Normal distribution (bell shape curve), and

the values here allow the standard deviation of those curves to be specified. The individual

errors are:

a. Muzzle velocity. This is the percentage of variation in the muzzle velocity of a round

that is fired. For example, a value of 0.01 would mean a 1% variation in the muzzle

velocity. High values of error here will result in wildly erratic falls of shot.

b. Orientation error. This is the number of mils to which the gun is likely to vary left or

right between shots. Note, unlike muzzle velocity, it is an absolute number of mils,

not a percentage.

c. Elevation error. This is the number of mils to which the gun is likely to vary up or

down between shots. Like orientation error, it is an absolute number of mils, not a

percentage.

7. Actual errors. The errors specified above are the estimated errors and are used to calculate

probable error by the fire control computer. In contrast, the actual errors will result in actual

deviations in fall of shot. Estimated and actual errors are separated so that the user may

simulate a belief that the guns are more accurate than they actually are, or vice versa. The

individual components of the actual error are the same as described above.

8. Number of rounds. Here the user can specify the initial number of rounds of each type for

each of the guns in this Battery.

9. Record Target Prefix. The target name for each Battery starts with this prefix. Targets which

are recorded without specific names are recorded with this prefix. Using the same prefix for

two or more Batteries will create confusion in recording targets. Therefore it is advisable

that separate prefixes be used for different Batteries.