The BullsEye Archery Rangefinder
works on the same principle as the bracketing rangefinders found on some
high-end rifle scopes.
Suppose you see an object, for
example, a flag pole that is 20 feet tall, at some unknown distance
away. If you take a ruler, hold it at arms length and measure how
long the flag pole appears to be, you can calculate how far away the
flag pole is from your eye.
The BullsEye Archery
Rangefinder program incorporates the same mathematical principles used
by mathematicians and engineers for centuries. The program does
all of the calculations and prints out a deadly accurate range finder
that is customized for you and the game animal that you will be hunting.
is an example of the rangefinder printed out by the program,
with the yardages for each of the scale lines added to
illustrate how to read it.
The bottom line is the baseline, and is lined up with your
target's belly. The yardage to the target is determined by
where the animal's back falls along the scale. See below
the range finder to determine the yardage to your target is very easy
and fast. You simply line the baseline on the range finder up with
the belly line on your game animal and look to see where the animal's
back line falls. (See the example to the right)
If the animal's back falls
halfway in between yardage lines, for example in between the 20 and 30
yard lines, then the animal would be 25 yards away.
The program also allows you to
choose colors for your rangefinder that match the colors on your bow's
sight pins. This helps you to quickly choose the correct sight pin
when that trophy animal steps out.