Tasco OffShore Manual De Instrucciones página 5

II. Using the Reticle and Dial to Determine Distance or Size
Offshore models 36 and 54 have two ranging tools. The eyepiece Reticle Scale and the Calculator
Dial can be used to determine your distance from an object if its size is known, or vice versa. Please
refer to the illustrated example on the next page as you read the following directions.
When the object size is known, its distance is determined as follows:
1. Look through your binocular and place the horizontal reticle line at the base of the object
2. Count the number of reticle divisions from the base to the top of the object. (In the example on the
next page, the top of the lighthouse comes to 2.5 on the Reticle Scale)
3. Rotate the Calculator Dial and place this number (2.5) at the Angle Index Mark
4. Assuming you know that the height of the lighthouse is 100 ft., look to the right of the Angle Index
Mark and find the object size on the scale labeled "Object Size". In this example, use "10".
NOTE: The object size divisions are from 1 to 20. In dealing with an object that is 100 feet, mentally
add a zero to the 10 indicator on the object size scale.
5. Now read the distance scale directly beneath the object size. It is 400 but remember, because you
added a "0" to the "10" in Step 4, you must add a zero to the 400. Thus, the distance from you to the
lighthouse is 4000 feet.
IMPORTANT: Always remember that the Distance and Object Size scales are in a "ratio" to each other.
When you add "0's" to one, you must add an equal number of "0's" to the other as we did in Steps
4 and 5 above.
5