How to Use
First, adjust the width (interpupillary distance) of your binoculars so that when you look through them, you see a single circular image. Then focus the binocular for one eye at a time by turning the ocular (eyepiece) until you see an equally sharp image with each eye.
If more than one person will be using the binoculars, you should mark the left and right eyepieces for your own vision to permit quick readjustment.
Using the Compass
The compass is a precision unit. It has extremely fast damping so that there is almost no swing and is connected for dip (Latitude). The compass scale is in one degree increments and is aligned with the vertical range finding scale.
When using the compass, always keep in mind the local variation between magnetic and true north.
Special instructions for Compass
How to use the built-in compass light and reticle.
The Bushnell Navigator Compass Model comes with built-in LED compass illuminator for use at night and in low light conditions.
(Incidentally, the compass is built into the left tube of the binocular but the push button control for the light and the battery are located in the right tube. This was done to minimize the chance that electrical interference might affect compass performance.)
When the ambient light does not permit you to see the compass heading clearly, press the button atop the right tube. If the light is dim or does not come on, replace the batteries. If the light does not operate after replacing the batteries, please contact the Bushnell dealer nearest you.
How to change the batteries
To change the battery, use a thin coin to remove the battery cover by turning it counter-clockwise. Remove the two batteries. The batteries have a (+) on the front and a (-) on the back. Be sure to insert the new batteries with (+) signs in the same direction. Replace the battery cover by turning it clockwise.
How to use the Reticle
The vertical scale (Reticle) is visible through the left half of the binocular, above the compass display, and allows you to calculate distance to an object if you know its height, or to calculate the height of an object if you know its distance from you.
Each mark on the vertical scale has a value of 5 MIL (1 Mil is equivalent to an angle that can determine an object one meter in height at a distance of 1000 meters).
Therefore, if a navigation chart gives the height of an object, by sighting on it and counting the number of MILs, you can determine how far away it is.