4.6.1 Calibration

To calibrate the screen image, you must have something on the target of known real length. This can be an aiming square or circle or a mark you place on the target for calibration. In a pinch, you can use the bullet diameter if the holes are cut cleanly.

Calibration is easy, only takes a couple of seconds and only needs to be done once per target. When the Graphical Entry Page is first opened with a new target image, the ``Cal'' tool button is automatically selected and ShotStat is in calibration mode. To calibrate:

1. Place the mouse cursor on one end of the known distance mark on the target and Left Click.
2. As the mouse is moved, the 'calibration line' follows the mouse cursor. Move the mouse to the other end of the known distance mark.
3. Left click the mouse; the length of the line on the screen should be the same as the known distance on the target image. If not, simply start over at Step 1.
4. When the calibration length is entered (Step 3), ShotStat opens an Input Box so you can enter the real length, in inches, that the calibration line represents. The initial default is 1 inch, but the user can save an alternative default value. See Section 7.1.

Note:

The Real Length has to be entered as a decimal value, not a fraction. See Section 9, Decimal Equivalents.