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Archer's Advantage provides accurate sight settings for any archer using a sliding (Freestyle) sight. After entering setup information that characterizes your equipment, Archer's Advantage will accurately calculate Arrow Speed from any two Sight Settings and print out Sight Tapes calibrated in Yards or Meters. These Sight Tapes provide you with exact sight settings in one yard or one meter increments.

Even if two bows have the same arrow speed, sight settings will differ depending on the type of arrow you are shooting and the way you set up your bow. So, how does Archer's Advantage provide you with accurate marks for any setup? Archer's Advantage uses the Setup information you provide the program to calculate Arrow Drag and Parallax Error for your equipment.

Arrow Drag causes your arrow to slow down on the way to the target. Accurately characterizing arrow drag requires the following setup information: Arrow Diameter, Arrow Length, Arrow Weight, and Fletch Length. This information allows Archer's Advantage to calculate initial arrow speed from two sight settings. With initial arrow speed and arrow drag, Archer's Advantage can accurately determine arrow drop at any distance.

When you reach anchor, your aiming eye is several inches above the plane of the arrow. This introduces a parallax error when you aim. It is this parallax error that causes your sight to go backwards (down the sight) as you start shooting distances shorter than 10 to 12 yards. Parallax error increases the closer you get to the target. The rate of change in parallax error is relatively small at longer ranges but increases dramatically as you approach ranges under 15 yards. As part of the setup information, you enter Peep Sight Height (at full draw) and Peep Sight-to-Sight Distance (at full draw). Since FITA shooters have no Peep Sight, they should use their Aiming Eye as a reference point in place of the Peep. These measurements allow Archer's Advantage to accurately determine the parallax error for any range.

When Archer's Advantage calculates a sight setting it uses the range to target to calculate Arrow Drop and Parallax Error. It then combines Arrow Drop with Parallax Error to provide the correct sight setting for the selected range.

Sight Length is measured at Full Draw from your Peep Sight to your Aperture/Scope to the nearest 1/4". If you do not use a Peep Sight, measure your Sight Length from your Aiming Eye to your Aperture/Scope.

Measure Peep Height from the center of your Peep, at full draw, straight down to the center of your arrow shaft to the nearest 1/4". If you do not use a Peep Sight, measure the distance between your aiming eye and the center of the Arrow Shaft.

Measure the overall arrow length to the nearest ¼". This measurement will be approximately ½" to ¾" longer than AMO Standard. This measurement is used to aid in determining the drag of your arrow, and as such it is the total length of the shaft including point and nock that contributes to its drag.

Arrow Diameter is entered in 100ths of an inch. If you are using Easton Shafts, Archer's Advantage will automatically calculate the Arrow Diameter for you. If you are using Shafts made by another manufacturer you will need to measure the diameter of your shafts and enter the diameter to the nearest 100th of an inch.

Enter your Arrow Weight in grains.

Enter your fletch length to the nearest ¼". Archer's Advantage assumes that you are using low profile plastic fletching (such as Flex Fletch or Pro Fletch) on your arrows. If you are using some other type of fletching, you may wish to calibrate Archer’s Advantage drag calculations to your fletching using a Chronograph (refer to paragraph on Drag Offset).

Archer’s Advantage automatically calculates Arrow Speed when you provide the program from 2 to 5 sight settings. If you provide Archer’s Advantage with two sight settings the resulting speed calculation will be only as accurate as your two reference marks. When calculating arrow speed from two marks you should use marks as far apart as you are comfortable shooting. If you have difficulty getting solid marks, provide Archer’s Advantage with 4 or 5 marks and the program will use statistical analysis to weed out bad marks and provide you with a more accurate Arrow Speed estimate. Archer’s Advantage will also identify which of your marks is your best mark. You can use this mark as a reference when adjusting the pointer for your new sight tape.

You may also directly enter an arrow speed from a chronograph. However, you should only use a chronograph speed as a first estimate. Any sight tapes printed using a chronograph speed should keep you in or near the spot out to 80 yards. To ensure you have marks you can trust out to 80 or 100 yards, you should get a pair of good marks and let Archer’s Advantage calculate a new arrow speed!