Context
The calibration procedure will result in adjusting a set of coefficients. These coefficients are in turn used when processing target strength data in order to get a correct and as optimum result from
surveys as possible. The gain adjustments is calculated for each beam in the swath. This procedure explains how to calculate and display gain adjustment difference between two separate calibrations. Normally the gain adjustment values for two sets of calibration data will be small. Sometimes there are differences in certain beams and sometimes there are differences throughout all of the beams. Such erroneous results may occur due to disturbances during calibration such as jellyfish, fish or other and will in turn
affect the target strength calculations in surveys.A comparison between gain adjustments in two different calibrations will reveal such errors in an easy and visual way.