GeoAcoustics

Listening to the Seafloor: Why GeoAcoustics Is One of Marine Survey’s Best-Kept Secrets

They hold a King’s Award for International Trade. Their CEO’s peers describe their name as synonymous with reliability and effectiveness in the shallow water market. And they’re currently preparing to debut two new products at Oceanology International 2026 in London. This is a company that doesn’t shout loudly - but when you look at what they’ve built and who uses it, the track record speaks for itself.

Interferometry Over Multibeam: A Deliberate Choice

Where most companies in the bathymetric sonar space defaulted to multibeam echo sounder technology, GeoAcoustics took a different path. Their flagship GeoSwath 4 bathymetric sonar is built on interferometric principles - and the difference is significant. Interferometry works by measuring the phase difference between returning acoustic signals across a wide receiver array, producing an extraordinarily broad swath of seabed data from a single pass. The GeoSwath 4 covers bottom area up to 12 times the water depth on each side of the vessel, with a total field of view stretching to 240 degrees - all the way to the waterline. No multibeam system at this price point comes close to that coverage.

Available in 125, 250, and 500 kHz variants to suit depth ranges and resolution requirements, the GeoSwath 4 also delivers high-resolution side-scan imagery alongside its bathymetric data - two datasets from one instrument, one deployment, one pass. For survey teams where vessel time costs money, the economics of that are hard to ignore.

AI That Does the Work Nobody Wants to Do

The most recent chapter in the GeoSwath 4’s development is the addition of onboard artificial intelligence - and it addresses one of the most persistent frustrations in professional hydrographic survey: data quality control.

IHO S-44 is the international standard governing the quality of hydrographic survey data. Meeting it requires careful, skilled data processing that has traditionally happened after the surrey - back in the office, often days after the vessel returned to port. If a problem is discovered at that stage, going back out to re-survey is expensive, slow, and sometimes impossible if the vessel has moved on.

GeoAcoustics’ AI system processes bathymetric data in real time during acquisition, identifying quality issues and flagging them to the operator while the survey is still underway. That means problems can be caught and corrected on the water rather than discovered weeks later. It’s a practical, operational improvement that saves real money and time - and it’s built into the GeoSwath 4 platform rather than bolted on as an expensive add-on.

A System for Every Platform: GeoSwath 4 in All Its Forms

One of GeoAcoustics’ strengths is that their core bathymetric technology is available in configurations designed for radically different operational contexts - without compromising on the underlying performance.

GeoSwath 4 is the flagship vessel-mounted system. Powerful GS4 software is included as standard, and the system is designed for full professional survey workflows from hydrographic charting to dredging monitoring.

GeoSwath 4R is the ruggedised variant - built around an IP66-rated slash-proof deck unit for operators working in exposed deck conditions where weather and spray are a constant reality.

GeoSwath 4 USV takes the same interferometric core and packages it for integration on unmanned surface vessels. Easy installation on diverse USV designs, the same 240° field of view and 12x depth coverage, and full GS4 software support - making it one of the most capable bathymetric payloads available for the rapidly growing autonomous survey market.

GeoSwath 4 PHS is a complete positioning and heading sensor package - GNSS position and heading, motion reference unit, sound velocity sensor, and sound velocity profiler, all integrated with the GeoSwath software - removing the need to source and integrate these components separately.

What’s Below the Seabed: Sub-Bottom Profiling

GeoAcoustics’ sub-bottom profiler range - the GEoPulse 2, GeoPulse Compact OTS, and Topas parametric sonar - addresses the question that bathymetric data can’t answer: what’s underneath the sediment? Buried pipelines, unexploded ordnance, geological strata, archaeological deposits - all invisible from the surface, all detectable with the right sub-bottom system.

The GeoPulse 2 is the latest generation of GeoAcoustics’s workhorse pinger, designed for easier deployment and more flexible operation than its predecessors. The Topas is the premium option - a parametric sonar that generates its operating frequency by combining two primary frequencies, producing an extremely narrow beam with exceptional sediment penetration and resolution. It's the choice for demanding geological and archaeological surveys where image clarity below the seabed is critical.

Side Scan Sonar: Precision Acoustic Imagery at Scale

The GeoScan 2361 and GeoScan 2491 are GeoAcoustics’ dual-frequency towfish side-scan sonar systems - built for collecting precision acoustic imagery across diverse applications from UXO detection and pipeline survey to environmental monitoring and seabed characterisation. Dual-frequency operation gives operators the flexibility to trade range for resolution on the fly, adapting to survey requirements without changing equipment. Combined with the GeoSwath 4’s simultaneous side-scan capability, GeoAcoustics users can build a complete acoustic picture of the seabed in fewer passes than any competing single-instrument approach.

Forty-Five Years and Still Building Something New

GeoAcoustics began as ORE Ltd in 1978, founded by Dave Stone and Dick Stafford as an offshore research equipment leasing operation. Side-scan, sub-bottom profiling, acoustic positioning, telemetry - the full suite of tools that underwater survey relied on in the late 1970s. The company has changed ownership twice since then, but today operates as an independent business, ISO 9001:2015 and ISO 14001:2015 accredited, committed to a net-zero roadmap at its Norfolk headquarters.

The consistency across that history - the same focus on interferometric bathymetry, the same commitment to shallow-water performance, the same preference for field-proven reliability over feature-list marketing - is what gives GeoAcoustics its reputation. It’s a company that has been doing this long enough to know what actually matters on a survey vessel, and builds its products accordingly.

With two new products debuting at Oceanology International 2026 and a global partner network covering every major marine survey market, the next chapter looks as strong as anything in the previous four decades.

Find Out More: GeoAcoustics Ltd | Marine Survey Technology