Call For Fire
I.
Six Elements
a. Essential Elements
i. Identification
1. ( FDC call sign ) this is ( observer call sign )
ii. Warning Order
1. Type of Mission
a. Adjust Fire
b. Fire for Effect
c. Immediate
d. Suppression/SMK
e. Suppression
2. Method of Location
i. Grid (Minimum six digits. Can send ten digit grid)
ii. Polar
iii. Shift from Known Point
iii. Target Location
1. Grid ( Minimum six digits )
a. If firing an adjust fire grid mission, the FDC requires a direction
(nearest 10 mils) from the observer to the target with or prior
to the first correction being sent.
i. This information is sent as the fourth transmission
2. Polar
a. FDC needs to know observers position prior to the call for fire.
b. Three elements
i. Direction (nearest 10 mil)
ii. Distance to TGT from your location (Nearest 100
meters)
iii. Change in elevation (U/D)
1. Only send if greater than 35 meters
2. Send in increments of five meters.
3. Shift from Known Point
a. FDC needs to know target number or known point that the
observer is shifting from.
b. Direction
c. Lateral shift
i. R/L ( meters )
ii. Worm formula
1. W = R X M
2. W = the left or right lateral shift this transmitted
to FDC
II.
3. R = range from the observer to the known point
divided by 1000.
4. M = difference in mils from the known point
direction and the target direction.
d. Range Correction
i. Add / Drop (meters)
1. If target is beyond the known point (add)
2. If target is short of known point (drop)
e. Change in elevation (U/D)
i. Only send if greater than 35 meters
ii. Send in increments of five meters
iv. Target Description (SNAP)
1. Size
2. Nomenclature
3. Activity
4. Protection
b. Optional Elements
i. Method of Engagement
1. Danger Close
a. Artillery ?
b. Mortars ?
2. Ammunition
a. DPICM
b. WP
c. Smoke
d. SADARM
e. Illum
3. Trajectory
a. High angle
b. Low angle
ii. Method of Fire and Control (WAT)
1. When Ready (Less control faster response)
2. At My Command (Able to Mass Fires and better effects)
3. Time on Target
Five Rule of Direction (OMG 10-4)
a. Observer to target
b. Mils
c. Grid
d. Nearest 10 mils
i. 0012 = 0010
ii. 0017 = 0020
e. 4 – digits
III.
Adjustment procedures
a. The observer makes corrections to move the round to the target
b. Corrections are made using
i. Left/Right (nearest 10 meters)
ii. Add/Drop
1. The range for the first round is based on the observers best judgment
2. Successive Bracketing
a. Establish a bracket with one round over and one round short
b. Each bracket should be half the size of the previous
c. If the first round lands 250 meters over the target and a
correction of DROP 400 given for the second round. The next
correction should be ADD 200 and the fourth correction should
be DROP 100.
iii. Corrections less than 30 meters are not sent
c. Deviation Correction
i. Number of mils between the impacting round and the target
ii. Spotting multiplied by OT Factor = Deviation Correction
iii. OT Factor
1. Used to determine the Left/Right deviation correction
2. OT Distance (range from observer to target) is divided by 1000
a. If the OT Distance is greater than 1000 the OT factor is
expressed as a whole number (1.5 = 2).
b. If the OT Distance is less than 1000 the OT factor is expressed as
a decimal (.5 = .5).
iv. Spotting – the number of mils between round and the target that is measured
with binocular reticle pattern and the hand method.
1. Reticle tick marks are in increments of 10 mils
2. Hand method