Fig. 1 - Internal Rangefinder Reticle
and Directional Compass
Fig. 2 - Distance Scale
Directional Compass
3. Using the Internal Rangefinder Reticle to
Determine Height or Width of an Object ---
Each
short mark on the vertical and horizontal axis of the
scale has a value of .5 MIL. Each long mark has a
value of 1.0 MIL. To determine the height or width of
an object in MILs, center the object on the vertical
scale and position the horizontal axis at the bottom of
the object. Count the number of MILs on the
horizontal or vertical axis to determine the width or
height of the object. For example, the lighthouse is 7
MILs high.
1. Installing Batteries
1. Remove rubber cap
2. Remove gold flat cover
3. Insert two (2) batteries (LR43 1.5v) positive (+)
side up
4. Using the Distance Scale to Determine
Distance to the Object ---
To determine object’s
distance using the Distance Scale follow the following
steps (Refer to Fig. 2.):
1. Use the Internal Rangefinder Reticle to calculate
object size (See Fig.1. example).
2. Rotate the upper ring of the binocular’s distance
scale and align the number of MILs under the arrow
adjacent to ANGLE.
3. Locate the size of the object (MIL number) on the
middle scale - OBJECT SIZE.
4. You can now read the distance at which the object
is located on the lower scale - DISTANCE - under
OBJECT SIZE MIL number notation.
4. Mathematical Formulas for Determining Object Size or Distance to Object ---
Use one of the
following formulas if you know the size or distance to the object.
INSTRUCTIONS FOR USE OF INTERNAL RANGEFINDER RETICLE
AND DIRECTIONAL COMPASS --- DEEP SEA MODELS AB10160/AB101800 AND AB10798
1
1
1
2
3
4
2
3
4
2
3
4
5
6
7
1. To calculate the DISTANCE (object size must be determined):
100 x Object Size
Rangefinder Scale Reading
Distance =
2. To calculate the SIZE (object distance must be determined):
Distance x Rangefinder Scale Reading
100
Object Size =
2. Using the Directional Compass
- The compass scale is in one degree increments.
It is aligned with the vertical range finding scale. North is represented as 0, East as 90,
South as 180 and West as 270. When using the compass bear in mind the local variation
between magnetic North and true North.
AB10160 / AB10800
AB10798
ANGLE
OBJECT SIZE SETTING
DISTANCE SCALE
BATTERY COMPARTMENT
o
o
o
o
