Artillery Procedures




Battery Diagram

Battery Set-up
  1. Assign Roles of FDC, Gunner, and Loader/Ammo Man.
  2. Locate the 8-Digit grid reference and elevation of the M119.
  3. Determine the direction of fire for the Howitzer in Mils.



Fire Direction Center - Operation of the BCS:
  1. Get inside any seat of the Utility HMMWV(BCS).
  2. Use the action menu to select “Use AN/GYK-37 BCS”.
  3. Assign battery name and call-sign.
  4. Enter battery’s Grid Ref, Elevation, and DoF.
  5. Assign Target Prefix and Start Number, [Ex. [1], [1], as in Prefix 1, Start 1]. Setting these to 1 and 1 will set the Fire mission ID number to 10001. This may be used in AARs and similar.
    BCS Main Screen: [image]



Target Data Input (GRID)
  1. Input Target Grid Reference and Target altitude under Mission Grid Reference.
  2. Target Description section is where the FDC records information detailing the target. This is for note keeping only at the moment.
  3. Under Method of Engagement, choose ammunition, fuze type, Round Count. If using the Adjust Grid firing mode, then the number of adjust fire rounds and which gun piece is firing.
  4. Method of Control is to detail how/when the FDC wishes for the battery to fire. This will be translated in the Fire Solutions.
    BCS Grid Targeting Screen: [image]



Target Data Input (POLAR)
  1. Select Observer.
  2. Input Observer/Target Direction
  3. Input Observer/Target Range
  4. Input Observer/Target Altitude Difference
  5. Target Description Area for book-keeping/note-taking.
  6. Choose round count, and adjust fire data.
  7. See Target Data Input (GRID) for more detailed instructions on Method of Engagement and Target Description.
    BCS Polar Targeting Screen: [image]



Fire-For-Effect Screen
  1. Battery Information reads off the two solutions calculated by the computer. The solutions contain all the information the battery needs to properly send the fire mission.
    (If there is an Azimuth reading, determine the difference of the Azimuth and the Deflection. If the difference is greater or less than 800mils, adjustments might need to be made.**This needs further research to confirm**)
  2. The Messages to the Observer read off the information about the fire mission to the observer calling it in. This readies him so he knows what to expect.
  3. BDA Section for note taking purposes.
  4. Notes Section for note taking purposes.
  5. Click Back to keep the current target data.
    BCS Fire-For-Effect Screen: [image]



Fire Solution Screen (ADJUST)
  1. This firing method allows for the battery to preform an adjust fire mission before the main fire for effect mission.
  2. The fire mission will list:
    1. Number 2 : Defines Gun #2 will be performing the adjust fire.
    2. 6 Rounds : # of rounds for Adjust Fire Mission
    3. (Gun Set-up Data) : Information the guns use to align with the target as well as the round type/count and fuze type.
  3. At the bottom lists ADJUST. This is so the battery can adjust their fire, perform another fire mission, so that they can get on target.
    1. OT. Dir : Observer/Target Direction. This angle of the target relative to the observer.
    2. Left/Right - If target is left or right of impact point, FO must estimate how far and report that distance. (Left = Postive ; Right = Negative)
    3. Add/Drop - If target is further/closer to the previous impact point, FO must estimate how far. (Negative Num’s for Drop)
    4. Up/Down - Altitude Difference compared to impact point and target. (Up = Positive ; Down = Negative)
  4. Once the rounds are on target, hit FFE to get the Fire For Effect mission.
    BCS Fire Solution Screen: [image]



Round Preparation
  1. Go to 105mm Ammo Box by your Howitzer.
  2. Use the ACE Interaction Key(AIK) on an ammo-box and select Prepare Round.
  3. Choose the correct charge # and fuze type, then click on Prepare Round. The round will appear behind you when it is ready.
  4. Use the AIK on the shell and select “Pick up Round”.
  5. Bring the shell to the gun and again using the AIK on the gun, choose “Load Gun”.
  6. If fire-mission calls for more than one round, the ammoman/loader may set the shells down next to the gun using the ACE Self-Interaction key once a shell is picked up.
    Round Preparation Screen: [image]
    Note: When using a timed Fuze, the fire mission should give a fuze time in the details. This will go by the name of “Time”. It is suggested to use that setting on the timer for maximum effectiveness; however, experienced FDCs can adjust this timer to allow for customization of the spread and effectiveness of the rounds.



Gun-sight Alignment (Destroyed/No Collimator)
  1. Enter gunner seat of M119, use the Action Menu to open the Gun-sight Options. (Last selection on the bottom of menu).
  2. Set Deflection and Elevation to the fire-mission’s specs.
    [Note: If you press shift while clicking, the settings will adjust by 10, and holding shift+ctrl they will adjust by 100. This applies when moving the barrel as well.]
  3. Shift the whole gun so the gun-sight is aligned with the Aiming post. This will be easier if you, the gunner, stay inside the gun looking through the sight and have your Loader turn the gun for you.
  4. Adjust the barrel for parallax error.
    Sight Alignment Screen: [image]



Gun-sight Alignment Screen Explanation

Def. - / Def. +
Deflection +/-

El + / El -
Quadrant Elevation +/-

Op. - / Op. +
Optic Angle -/+

Re + / Re -
Unknown, SUGGESTED DO NOT TAMPER WITH!(Adjusts Deflection Reading)

Traverse
Represents how far the barrel can traverse before needing to turn the whole gun assembly.

Level
Represents the angle required to align the barrel with the Fire Mission’s Quadrant Elevation setting. (Align the circle in between the two vertical lines in the center)

Elevation
Reads the current Elevation Setting

Deflection
Reads off the current Deflection Setting



Parallax Error Identification and Adjustment:
You will know you have some parallax error when the aiming posts for your gun are not lined up in your sight. To adjust for it you must measure the horizontal distance between the rear and front post. Depending on which side the rear post is on dictates which direction you correct for. If it is on the left, adjust left, and if on the right, adjust right. You will want to aim the barrel the horizontal distance between the posts to the direction of the rear post starting from the rear post.
Example of Parallax Error: [image] This example of Parallax Error has been corrected for properly.



Gun-sight Alignment (With Collimator)
  1. Enter gunner seat of M119, use the Action Menu to open the Gun-sight Options. (Last selection on the bottom of menu).
  2. Set Deflection and Elevation to the fire-mission’s specs.
    [Note: If you press shift while clicking, the settings will adjust by 10, and holding shift+ctrl they will adjust by 100. This applies when moving the barrel as well.]
  3. Shift the whole gun so the gun-sight is aligned with the Collimator. This will be easier if you, the gunner, stay inside the gun looking through the sight and have your Loader turn the gun for you.
  4. Adjust the traverse of the barrel to properly align the numbers on the collimator with the numbers on the reticule of the gun-sight. The up-slope of the numbers refers to which side of the gun-sight must be aligned: Slope up to the left, align left. Slope up to the right, align right.
    Default Alignment: [image]
    Proper Alignment including Parralax Correction: [image]



Firing Procedure
  1. After the fire-mission is ready the FDC will relay the fire-mission data to the Loader/Ammo Man and Gunner. Using the High Solution or Low Solution depending on the terrain between the target and the artillery battery.
  2. Ammo-Man will prep round according to the fire-mission’s requirement.
  3. Gunner will align the the gun-sight and with the assistance of the Loader, align the gun to properly face the target.
  4. Gunner will await the OK from the FDC to preform the fire mission unless specified otherwise.
    Firing Procedure Diagram: [image]