Abstract: The article discusses forms of visualisation on the monitors of an MCM side scan sonar with towbody modernised by the DMES. The introduction gives an overview of the structure of the sonar, how it collects signals and the nature of the signals. This forms the basis for how the signals are visualised. Next a description is given of other factors which determine the form of visualisation on the sonar’s monitors. They are the operator’s tasks and the display of the settings, the readings of additional sonar sensors, how the system cooperates with other onboard systems, operator training and ergonomics. Examples of visualisation are included.