TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
Page 314 of 775
TM 9--2350--311--10 2--216 Change 6 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.6 Laying For Direction and Quadrant During Indirect Fire Mission — Continued a. Laying for Direction Using M1A1M1A2 Collimator — Continued NOTE If there is no weapon displacement, gunner’s sight picture should appear centered as shown. 4 To correct for weapon displacement, gunner must match M117/M117A2 panoramic telescope reticle (8) with M1A1/M1A2 collimator reticle (9). Numbers in M1A1/M1A2 collimator reticle indicate 5-mil increments. Individual mils are indicated by short lines in V format of pattern. For example, if gunner sees 10 and 15 in M1A1/M1A2 collimator and reticle pattern slopes upward from right to left, weapon has experienced right displacement. To compensate for this displacement, gunner matches left portion of M117/M117A2 panoramic telescope reticle with M1A1 collimator as shown. 5 If gunner sees 10 and 15 in M1A1/M1A2 collimator and pattern slopes upward from left to right, weapon has experienced left displacement. To compensate for this displacement, gunner matches the right portion of M117/M117A2 panoramic telescope reticle (8) with M1A1/M1A2 collimator reticle (9), as shown. NO DISPLACEMENT RIGHT DISPLACEMENT LEFT DISPLACEMENT 8 9 9 8 9 8