Figure 14-14.--Arm-and-hand signals used in placing out aiming post.
rechecks to see that all level vials are centered. When
placed on the new line of sight by the first ammunition
the center of the barrel and the sight of the compass are
bearer, observing the arm-and-hand signals (fig. 14-14)
in line and all bubbles level, the gun is laid. The section
of the gunner. The posts are called the far post and the
leader then directs the gunner to refer the sight and put
near post. The far post is placed out 30 to 50 meters from
out their aiming posts. "Refernng the sight" means
the mortar, and the near post is placed at 15 to 30 meters
making a deflection change on the sight without moving
(fig. 14-15). When this is not possible, because of terrain
the mortar. To refer the sight, you turn the deflection
or situation, the post should be placed out as far as
knob until the given deflection is set on the sight. When
possible, keeping in mind that the distance between the
using the M64/M64A1 sight, you can place the aiming
two posts must be equal. The far post is always placed
posts where they can best be observed because the
first and the near post last. When these two posts are
deflection scale can be slipped to read the desired
seen through the sight, they appear as one. This is called
deflection. The sight (M64/M64Al) is initially referred
to a O-nil reading, and the aiming posts are set on that
deflection.
PLACING AIMING POSTS
Normally two aiming posts are placed out to
establish the aiming line. The rounds are fired from the
mortar in reference to this line. After the mortar has been
mounted and laid on the direction stake, the sight is
normally refereed to 2,800 mils, and the aiming posts
Figure 14-15.--Aiming post and lights (M58/M59).
are placed along this line of sight. The aiming posts are
14-9