The CM2 product family

CM2 Digital Towfish

The CM2 family of towfish includes two versions, the Standard and the DeepTow. Each version incorporates dual frequency operation, with a choice of two configurations, DF (100/325kHz) and EDF (325/780kHz).

For general survey tasks DF towfish are often the most useful. In 100kHz mode the search swath is up to 1000m wide, useful for searching for larger objects such as wrecks or freight containers. In 325kHz mode it is usually possible to distinguish such objects as mooring ropes, anchor chain, anchors, scour marks, pilings, crab pots, rocks (down to the size of a briefcase or less), as well as differences in seabed texture.

Towfish on blue background

The CM2 Standard towfish. Specifications

EDF towfish offer the highest resolution. Like the DF towfish they offer 325kHz operation out to 150m. The EDF's 780kHz frequency gives the most detailed images, very useful for positively identifying an object first located at 325kHz.

The choice between Standard and DeepTow versions depends on the intended typical working depth and on the size of the towing vessel. Both versions are rated to 2000m but the Standard towfish can be launched and recovered by one man and is the first choice for any work down to a 100m depth, particularly from survey launches or similar small boats.

Deeptow fish

The CM2 DeepTow towfish. Specifications

The DeepTow, with its extra weight, is designed for use on larger survey ships, typically in conjunction with long, larger diameter tow cables.

Note that the complex HF sonar transducer configuration in both types of towfish is unique to C-MAX. It produces powerful, flat-topped transmit and receive beams complemented by additional coverage below the towfish. This gives wide high quality images and enhanced immunity from surface reflections.

Towfish beam detail

C-MAX's unique towfish beam pattern

All of the towfish models feature: