What G-tec does

G-tec S.A. is a Belgian marine geophysical and GIS services firm founded in 1993 on an academic background and headquartered in Milmort, Belgium, operating as a wholly-owned subsidiary of the DEME Group with a French subsidiary (G-tec SAS). The company delivers specialized site investigation services — including 2D and 3D Ultra-High Resolution Seismic (UHRS) surveys, UXO detection, boulder detection, seabed characterization, and asset integrity inspections — for offshore energy, marine infrastructure, ports, dredging, and coastal development projects. G-tec reports it has executed more than 2,000 projects in 95 countries across five continents for over 500 customers, with a team of approximately 80 multi-disciplinary specialists.

G-tec's technical edge rests on the proprietary MagWing vertical gradiometry frame for UXO detection (developed in-house in the early 2000s, with the MagWing 6.8 variant using eight magnetometers on a 6m frame steered by a Scanfish ROTV) and on MyGIS, a web-based GIS platform that consolidates project data, supports differential analysis, volume calculations, dashboards, and real-time geo-hazard alerts. The firm deploys a tailored fleet including the 55m DP vessel Karina (added 2024), the 50m DP2 chartered Mainport Geo (multi-year charter from 2023), the 13m catamaran Faraday for nearshore work, and the trailerable D-Tect for inland waterways, supported by integrated multibeam, side-scan sonar, sub-bottom profiler, magnetometer, LIDAR, and 3D camera sensor packages, with on-board QC feeding near-real-time data transmission to clients.

G-tec generates revenue through project-based B2B professional services contracts with offshore wind developers, marine contractors, and government agencies, typically awarded through competitive tendering or direct engagement; pricing is not publicly disclosed. Marketing is conducted via direct enterprise engagement, the company website and project case studies, industry events (e.g., Oceanology International), and trade media. The firm holds ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 certifications and is repeated prequalified supplier to entities such as RVO (Netherlands) and RTE (France) for offshore wind site characterization.

Name

G-tec

Legal name

G-TEC S.A.

Website

https://g-tec.eu

Company type

Private

Founded year

1993

Operating status

Operating

Headcount range

101–250 employees

Short description

G-tec, a Belgian DEME Group subsidiary founded in 1993, provides specialized marine geophysical surveys and GIS platform services — including proprietary MagWing UXO detection and 2D/3D UHRS seismic — to offshore wind developers, government agencies, and marine infrastructure clients across 95 countries.

Ownership category

akta.pro rank

Product category

Marine Geophysical Survey Services

NAICS

Geophysical Surveying and Mapping Services (54136), Other Scientific and Technical Consulting Services (54169)

SIC

Oil & Gas Field Services, Nec (1389), Services-Commercial Physical & Biological Research (8731)

akta.pro primary industry

Mineral Exploration & Geoscience Services (Geology, Geophysics, Geochemistry, Resource Modeling) (IMAKAKAA)

akta.pro secondary industry

Third-Party Certification, Code Compliance & Regulatory Inspection (ASME/API/ISO) (EUAEAHAN)

Keywords

• Marine geophysical surveys
• UXO detection services
• Seabed characterization
• Offshore wind site investigation
• Marine GIS platforms

Headquarters

HQ city

Milmort

HQ country

Belgium

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Geophysical Survey Services: G-tec provides specialized geophysical and GIS services to customers operating in offshore energy and marine infrastructure. Services include seismic surveys, UXO detection, boulder detection, seabed characterization, and asset integrity inspections. Revenue is generated through project-based professional services contracts with developers, contractors, and public authorities. Projects are typically awarded through competitive tendering and direct engagement.
2. GIS Platform and Data Services: Web GIS platforms (MyGIS) dedicated to marine infrastructure projects through their complete lifecycle. Services include data management, visualization, analysis tools, and interactive dashboards. GIS services are offered in combination with geophysical services and as standalone consulting engagements.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

G-tec delivers specialized marine geophysical survey services and GIS platform solutions for offshore energy and marine infrastructure projects. Core offerings include 2D/3D Ultra-High Resolution Seismic surveys, UXO detection and clearance (using proprietary MagWing gradiometry systems), boulder detection, seabed characterization, asset integrity inspections, and the MyGIS web-based GIS platform for project lifecycle data management. Services are delivered by expert crews operating a fleet of specialized survey vessels to clients across offshore wind, ports, dredging, and cable/pipeline sectors.

Product overview

G-tec provides specialized geophysical and GIS services for marine infrastructure projects, operating as a technology-forward service company with proprietary in-house developed equipment. The core portfolio centers on MagWing (vertical Gradiometry frame) and MagWing 6.8 for UXO detection, combined with MyGIS web platform for data management and visualization. Services include seismic surveys (2D/3D UHRS, refraction), UXO detection, boulder detection, seabed characterisation, and asset integrity surveys. The company operates a diversified fleet including Karina (55m DP vessel), Mainport Geo (50m DP2), Faraday (13m catamaran), and D-Tect (trailerable vessel) to serve offshore energy, dredging, ports, and marine infrastructure projects across their full lifecycle.

Differentiator

Problem solved

Functional benefit

Products and services

• Seismic Survey Services Marine seismic survey services including 2D and 3D Ultra-High Resolution Seismic (UHRS), sub-bottom profiling, and refraction seismics. Used by offshore wind developers, marine infrastructure contractors, and port developers for foundation engineering, cable and pipeline routing, and seabed characterization.
• UXO Detection and Clearance Services Unexploded Ordnance (UXO) detection surveys using G-tec's proprietary MagWing multi-gradient gradiometer systems actively steered by Scanfish ROTV. Includes Master Target List creation, anomaly identification, and removal campaign management with ALARP certification. Targeted at offshore wind farm developers, cable route planners, and government authorities.
• Boulder Detection Surveys Boulder detection services using acoustic methods and multiple seismic sources to identify boulders above and below the seabed. Supports offshore wind foundation engineering and cable route planning by de-risking installation activities.
• Seabed Characterization Services Seabed characterization using multibeam echosounding for bathymetry and Digital Terrain Models, Side Scan Sonar for full-coverage acoustic imaging, and magnetometry for geological formation interpretation. Used by marine infrastructure and offshore energy clients for site investigation.
• Asset Integrity Inspection Services Underwater and above-water asset integrity inspections combining Multibeam and Side-Scan Sonar, ROV visual inspection, and aerial drone LIDAR and 3D camera mapping. Provides comprehensive above-and-below waterline inspection for offshore infrastructure owners.
• MyGIS Web Platform Web-based GIS platform that centralizes marine infrastructure project data and provides analysis, visualization, and information sharing. Covers full GIS scope from system architecture to web application delivery, including database design, volume calculation, differential analysis, works progress monitoring, and real-time dashboards. Offered standalone or combined with geophysical survey services.

Quantifiable outcome

• Over 2,200 km surveyed during Calvados offshore wind farm UXO campaign with identification of 3 actual UXOs, resulting in significant cost reduction for identification and clearance phases.
• +4 more outcomes

Named customers7 records

Segments5 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Five partnerships are on record, tiered core.

• RVO (Netherlands Enterprise Agency)coreStrategic or Co-development Partner · 1 August 2024G-tec was awarded a contract by RVO to perform a seabed survey for the Doordewind Offshore Wind Farm project in the North Sea. The survey of Lot 1 covers approximately 310 km2 and includes geophysical seabed investigations. RVO will share the data with wind farm developers to de-risk wind farm development in an early phase.
• RTEcoreStrategic or Co-development Partner · 1 June 2023G-tec SAS was awarded a contract by RTE (Réseau de Transport d'Électricité) to perform UXO detection along the theoretical AO5 export cable route in South Brittany, France. This is part of France's first large-scale floating offshore wind project (250MW). G-tec also provides geophysical data to DRASSM (Department of Underwater Archaeological Research) for submarine archaeological assessment.
• Irish Mainport HoldingscoreChannel Partner/ Reseller/ Distributor · 8 March 2023G-tec signed a multi-year charter agreement with Irish Mainport Holdings for the DP2 survey vessel 'Mainport Geo' (50m). The vessel was extensively modified in 2021 with a 15-tonne A-frame, robust side pole, hull-mounted dual head Kongsberg multibeam, and survey rooms. It provides accommodation for 35 crew and survey specialists and can stay in the field for up to a month. Deployed for ScotWind offshore wind farm surveys and the Doordewind project.
• GeominescoreStrategic or Co-development Partner · 1 August 2021Geomines served as the Explosive Ordnance Disposal (EOD) partner during the Calvados offshore wind farm UXO detection and identification campaign. Joint team of experts from the client, G-tec, and Geomines conducted collaborative iterative anomaly reduction process. Geomines issued ALARP certificates for identified UXO areas. This partnership was critical for the safe identification and disposal of three actual UXOs identified during the campaign.
• DEME GroupcoreOthersG-TEC is part of the DEME Group. As a DEME subsidiary, G-tec operates as part of a global marine engineering organization specializing in dredging, land reclamation, and offshore services. The DEME Group connection provides G-tec with access to a broader network of marine infrastructure capabilities and cross-selling opportunities.

Scale indicators7 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• Fugro: Global leader in geotechnical, survey, and geoscience services to offshore energy, infrastructure, and government markets. Directly comparable as the largest full-service marine site-investigation competitor, offering similar UXO detection, seabed characterization, and seismic survey capabilities at much larger scale.
• Ocean Infinity: Marine technology and survey company operating uncrewed and crewed vessel fleets for offshore energy and government clients. Overlaps with G-tec in marine geophysics and seabed mapping but operates at larger scale and across broader markets.
• RPS Group (a Tetra Tech company): Global consulting firm with a substantial offshore energy and marine survey practice spanning site investigation, GIS, permitting, and environmental services. Comparable in offering integrated survey-plus-consulting services to the same offshore wind and marine infrastructure customers.

Direct peers

• Gardline: UK-based marine survey specialist with a similar fleet of DP geophysical vessels and dedicated offshore wind site-investigation practice. Direct peer in marine geophysics, UXO detection, and cable-route surveys for the European OWF market.
• MMT Group: Swedish marine survey and consulting company specializing in seabed mapping, geophysical investigations, and hydrography. Direct peer offering comparable services for offshore wind, cable routing, and marine infrastructure clients across Europe.
• N-Sea: Dutch subsea solutions provider offering geophysical survey, UXO identification, and hydrography for offshore energy and infrastructure. Direct European peer with overlapping client base and similar service scope to G-tec.
• Deep BV: Dutch subsea engineering and survey firm providing UXO detection, geophysical surveys, and hydrography. Direct peer with comparable offshore wind tender experience and similar service portfolio to G-tec.

Emerging players

• Titan Environmental Surveys: UK-based marine geophysical and environmental survey contractor focused on offshore wind, cable routes, and intertidal surveys. Comparable emerging competitor serving similar North-West European offshore wind clients with similar vessel-based service model.
• Geo Marine Survey Systems: Marine geophysical survey contractor offering sub-bottom profiling, side scan sonar, and magnetometry for offshore wind, dredging, and port construction. Comparable emerging niche player with similar service offerings and customer types.

Regional players

• Bibby Marine / Hydromaster: Marine services group operating survey and accommodation vessels in European waters with similar geophysical survey offerings. Comparable as a vessel-based marine service provider but with stronger regional UK/North Sea focus.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/Gtec_Belgium

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about G-tec