TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9-2350-311-10 2–12 PREPARATION FOR FIRING — CONTINUED 2-12.7 Direct Fire Procedures — Continued b. Two Man/Two Sight System — Continued 3 Gunner centers M117/M117A2 panoramic telescope (1) cross-level (2) bubble, sets azimuth counter (3) to 3200, and turns direct fire bar knob (4) of azimuth knob (5) to direct position to engage 5.0 mils per click sight mechanism. 4 If central laying is used, gunner places announced lead on azimuth counter (3), sights through eyepiece (6) and traverses cannon tube until vertical hairline of M117/M117A2 panoramic telescope reticle (7) centers on the target. If reticle method is used, gunner places vertical hairline left or right of target, the number of mils lead announced by chief of section. 2-225