The purpose of this type of USBL System Calibration is to confirm that no biases are caused by the system's bearing information and that the speed of sound (scale factor) used in position calculations is correct. It is usually considered acceptable to use calibration results to remove any minor residual errors such as a bearing error of less than 1 or 2 degrees and speed of sound error within 1% or so. If large errors are found then the instillation of the USBL and its support equipment should be reviewed and necessary corrections made. The IPS System Calibration feature calculates and displays the overall azimuth (bearing) error in the system and gives the scaling factor to correct the raw slant range values. These results can be used to correct minor bearing errors or to determine if the USBL support equipment has been set up correctly. In addition to applying the calibration results to real time data to adjust minor discrepancies, the calibration results may also be saved for use at a later time or printed. The Calibration will work for both BATS, Trackpoint and LXT units and previously saved data may be loaded back into the software and used for calibration.