The CM2 Digital sidescan is made by C-Max Ltd., of Dorset, UK.
It is a recent upgrade to their previous CM800 series.
It offers a digital interface for control, with the option of either analog or digital
The CM2 is a true digital system - images are digitized in the towfish. Unlike sonars
that rely on analog towfish and analog telemetry, there is no loss of image quality
in the tow cable.
The top end Data Acquisition Unit was redesigned in stainless steel with an optional
integrated display, retaining its PC basis.
An analog output allows for interfacing to other sonar processors.
Data records can also be exported in digital form.
The CM2 family of towfish includes two dual frequency models, types DF and EDF. These
cover a total of three acoustic frequencies, namely 100kHz (LF), 325kHz (HF) and
All of the towfish models feature a digitally controlled, dynamically-optimized gain
profile, automatic towfish altitude measurement and a seabed proximity alarm. All
CM2 towfish are powered from the surface via the tow cable.
The standard CM2 Sonar Transceiver (STR) provides a serial (RS-232) interface for
control and telemetry, plus analog connections for the sidescan data.
OIC supports the C-Max CM2 sidescan (analog output) via GeoDAS-GA, providing a full
control, logging and real-time processing solution.