GeoAcoustics and Ocean Floor Geophysics Tackle Single Towfish Solution for Marine Surveys

GeoAcoustics Ltd and Ocean Floor Geophysics (OFG) have collaborated to develop a combined side scan sonar and magnetometer system housed within a single towfish. This innovative configuration integrates GeoAcoustics’ GeoScan side scan sonar with OFG’s Self-Compensating Magnetometer (SCM), streamlining acoustic imaging and magnetic detection into a single platform. GeoAcoustics announced the partnership, addressing a long-standing challenge in marine survey operations.

Addressing Traditional Limitations

Traditionally, deploying magnetometers alongside side scan sonars required significant separation to avoid magnetic interference from the towbody. This necessitated the employ of two separate towfish, increasing complexity in deck handling, layback management, and operational risk, particularly for smaller vessels and uncrewed surface vessels (USVs). Marine Technology News highlights this operational hurdle.

Single Towfish Configuration

The new system overcomes these limitations by integrating the SCM directly onto the tail of the GeoScan side scan sonar via a dedicated stinger assembly. OFG’s SCM’s self-compensation capability allows it to operate effectively in close proximity to metallic survey hardware, enabling true single-towfish deployment. This simplifies launch and recovery procedures, improves survey efficiency, and enhances operational safety.

Benefits for USV Operations

The development is particularly relevant given the increasing adoption of USVs in hydrographic and geophysical operations. Launching multiple towed systems from a USV presents practical challenges and increased risks. A single GeoScan towfish integrating the SCM offers a simpler, lower-risk configuration for remote and autonomous survey operations.

Applications Beyond UXO Detection

While particularly suited for unexploded ordnance (UXO) surveys – where both high-resolution seabed imagery and magnetic anomaly detection are crucial – the combined system has broader applications. These include cable route investigations, marine construction projects, archaeological surveys, and subsea infrastructure inspection, where complementary acoustic and magnetic datasets provide valuable insights.

Availability

GeoAcoustics and Ocean Floor Geophysics are currently finalizing development of the single-towfish configuration, with anticipated availability in the third quarter of 2026.