NATO
EU Stock NO.: 1005 99 212 5621 |
Manufacturers
Part No.: ACICOSG |
GS - 07F - 0259N |
CAGE:
3LQE0 |
The "Angle Cosine Indicator" is protected by U.S. Patent 6,568,092

The
"Angle Cosine Indicator," is a simple tool for hunters in
mountainous terrain, and utilized to obtain their corrected
for gravity distance to target.
The
ACI is a vault solid, water resistant precision instrument;
quiet and made from aircraft grade aluminum, which is anodized
in a flat black color.
The
Co-Sine numbers are Laser Engraved onto the body in five (5)
degree increments.
The lens is shatter proof, shock proof and resistant to chemicals
such as acetone and cleaning solvents.
Completely
mechanical, there are no batteries to fail, no electronics
to fail.

ACI
with numerals indicated in "Angle"
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Battle
Proven and in use by:
-
ACI with
numerals indicated
in "Co-Sine"
ACI with numerals
indicated in "Angles"
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| The
"A.C.I." works on any shoulder mounted weapon system . When the
weapon is held at an angle, the "A.C.I." indicates the co-sine
number of that angle by means of a highly visible index mark.
The co-sine number is then multiplied to the "Established Range",
(sloped distance to target), or inputted into the data entry point
of the users Ballistic Targeting Software, which gives you the
corrected for gravity distance to target. |
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There
are several ways to mount the device. One way is to utilize
a short, Weaver Base scope ring, which is mounted onto the scope
tube, at 90 degrees.
Another way is
to utilize a Badger
Ordinance mount designed to attach to a picantinny rail.
The mount works on all day and most night scopes. Close up of
the Badger Ordinance mount.
Schematic of Badger Mount |
| Bow
Hunter's using the ACI, LOVE it and so will you! When you know
your true distance to target, the guesswork of where to hold
is gone. It just takes a little more information to shoot expert. |

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How does
it work? One of three ways, but simple..
a. The
most accurate method is to input the cosine number into your ballistic
software; i.e. Exbal Ballistic Targeting Software or Field Firing
Solutions, that runs on either your home PC, Pocket PC or Palm Pilot.
This is because the software takes into account the trigonomics of
the fact that the bullet will still travel the full distance to target,
and maintain a similar time of flight.
b. Method
#2, is to multiply the cosine number to your MILRAD or MOA hold for
your distance to target as indicated on your data card. For example,
if your moa hold for 600 yards is 11 moa, and .87 is indicated by
the ACI, you would then multiply .87 X 11moa, and obtain a corrected
for gravity distance of 9.57 moa. This is fairly accurate, (Caliber
Specific) although not as accurate as utilizing ballistic software.
This is called the "Improved Rifleman Method."
c. Method
#3, is to multiply the cosine number to your sloped distance. This
will deliver the flat line distance to target, or what we call the
bottom leg of the triangle.
If you
experiment with your ballistic software, you will find that there
can be as much as eight (8) MOA difference between method #1 and method
#3. Method #1 is the most accurate & preferred method.
Now, adjust
the sight elevation knob (come-ups) on your scope, for the "corrected
range".
Ian's
Occupied Rock & Erwin's