To enter the transducer offset, also known as keel offset, select "Preferences..." from the "Options" menu and select the "Calibration" tab.
You will see an option "Use echosounder offset". Enable this option and enter the distance between the bottom of the transducer and the waterline in the "Z-Offset" box.
When this value has been entered in the echosounder itself, there is no need to configure this offset in Hydromagic in most cases.
