IHO-Compliant Hydrographic Surveys

Drone Sonar Surveys.

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Aerial-deployed tethered sonar buoys and USV (uncrewed surface vessel) integration for harbour, lake, and reservoir bathymetry beyond the reach of green-laser LiDAR.

“For every verified profile, we record the insurance and CAA credentials supplied at the time of review.”

Peter Leslie · Founder & GVC Drone Pilot

Trusted by site managers & agencies across the UK

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Drone sonar survey specialisms

Underwater profiling for harbours, reservoirs and inland waters — integrated with aerial capture.

Underwater bathymetry

Single- and multi-beam sonar bathymetry integrated with aerial shoreline capture.

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Harbour seabed profiling

Berth-pocket clearance and seabed change monitoring for port operators.

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Reservoir sediment mapping

Sedimentation monitoring for reservoirs and balancing ponds to inform dredging.

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Deep or access-restricted water needs more than a drone camera.

Dam engineers, harbourmasters, and reservoir owners need bed data where LiDAR gives up and manned boats cost a fortune to mobilise.

Deep Water Defeats LiDAR

Green-laser bathymetric LiDAR tops out around 3 m depth in clear water, and far less in turbid UK reservoirs. For reservoirs over 10 m deep or silt-laden lakes, only acoustic survey delivers reliable bed geometry.

Manned Vessels Are Slow

Mobilising a crewed survey boat with skipper, surveyor, and heave-compensated MBES costs £4k–£10k per day with weather-window stand-downs. A USV runs autonomous transects at a fraction of that cost, unmanned and on-schedule.

Restricted Access Sites

Water utility reservoirs, tailings ponds, and MOD waters often ban manned craft for biosecurity, contamination, or security reasons. A decontaminated USV deployed from shore avoids the problem entirely.

Sonar is acoustic physics, not a GoPro under a raft.

By Peter Leslie, Founder & GVC Drone Pilot

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Single-beam (200 kHz) echosounders suit reconnaissance work and deep reservoirs; multi-beam (240–400 kHz) delivers the sub-metre coverage dredge contractors and dam engineers actually need. Getting the wrong tool wastes the whole mobilisation.

Real USV work requires sound-velocity profiling at the start of each day, RTK-driven heave-and-tide correction, IMU alignment calibration, and patch-test validation. Without those, the data fails an IHO S-44 audit.

Every sonar survey on this network is flown and sailed by drone operators running proper USV hardware (SeaRobotics, Apache 3, or equivalent) with hydrographic surveyors processing the data, not drone hobbyists.

IHO-Compliant Drone operators

USV & Multi-Beam Specialists

Hydrographic outputs, engineered for asset decisions.

Our network operators deliver IHO Order 1a sonar data ready for reservoir engineers, dredge contractors, and dam safety reviews.

Bathymetric Charts

Single-beam or multi-beam chart of the bed, referenced to OSGM15 and tidal datum, delivered as GeoTIFF, XYZ, or CAD surface ready for direct ingest into engineering workflows.

Reservoir Volumetrics

Storage curves, sedimentation deltas between survey epochs, and dredge-volume calculations — essential for Reservoirs Act inspections, siltation monitoring, and water-supply planning.

CAD-Ready Contours

Contoured bed surfaces at client-specified intervals, exported as DWG/DXF for direct overlay onto dredge plans, harbour layouts, or dam downstream-zone mapping.

Book your sonar survey in 3 steps.

We review the brief against relevant verified profiles and current availability. If listed supply is limited, we will say so and source availability manually. Any pilot introduced must confirm equipment, permissions, timing and deliverables for the actual job.

Describe the Water Body

Tell us the site, depth range, area, access constraints (biosecurity, security, vessel bans), and the asset decision you need to support.

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Survey & Process

Your drone operator handles permissions, SVP, patch tests, and transect plans, then delivers charts, volumes, and CAD overlays via secure cloud link.

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Sonar & USV Survey FAQ

Technical answers on beam selection, compliance, and hybrid surveys.

When do I need multi-beam over single-beam?

Single-beam (200 kHz) is fine for reconnaissance, storage-curve reservoir work, and low-resolution volumetrics. Multi-beam (240–400 kHz) is required where sub-metre bed geometry matters — dredge volume tenders, harbour as-builts, dam toe inspections, and pipeline burial assessments.

How does USV compare to a manned-vessel survey?

On data quality, a well-calibrated USV with a modern MBES and INS is indistinguishable from a crewed survey vessel. On cost, it is typically 40–70% cheaper, with faster mobilisation, shallower access, and zero personnel exposure. The trade-off is transit distance — for large offshore surveys manned vessels still win.

Is the output IHO S-44 compliant?

Yes. Network operators deliver IHO S-44 Order 1a as standard — full feature detection, defined TVU and THU, and documented uncertainty. Higher orders (Exclusive, Special) are available where the asset risk justifies them. Reports include patch-test and SVP logs for audit.

Can you combine with drone LiDAR for shore-to-deep coverage?

Yes — hybrid surveys are the cleanest answer for most UK reservoirs and estuarine sites. Green-laser drone LiDAR covers the intertidal and shallows, USV sonar picks up from roughly 2 m onwards, and the two datasets are merged into a single seamless DEM referenced to a common datum.

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