What Gardline Group does

Gardline is a multidisciplinary marine survey company headquartered in Great Yarmouth, United Kingdom, providing geophysical, geotechnical, and environmental survey services to the offshore energy sector. Founded in 1969 and operating as a wholly owned subsidiary of Royal Boskalis Westminster N.V. since 2017, the company employs over 500 people and runs one of the world's largest fleets of permanently mobilised survey vessels. Its primary customer segments are offshore wind farm developers and oil and gas operators, with secondary engagement of EPIC contractors, government agencies (including UK Defra and Cefas), and academic institutes. The company reports completing more than 11,000 marine survey projects across geographies including the UK, Norway, Ghana, Sri Lanka, Nicaragua, and Australia.

Gardline's product portfolio is organized into three integrated service lines. Geophysical services span high-resolution 3D seismic (HR3D), site investigation surveys, 3D geohazard assessment, unexploded ordnance (UXO) surveys, cable and pipeline route surveys, seabed mapping, and nearshore surveys via the integrated Titan Environmental Surveys capability. Geotechnical services include offshore heave-compensated drilling, seabed sampling (notably the proprietary Deep Water Sampler capable of sampling to 15m below seabed), laboratory analysis, vibrocoring, and cone penetration testing (CPT) up to 200kN at 3,000m water depth. Environmental services cover marine mammal observation, passive acoustic monitoring (PAMS) using the in-house SOFAR system, marine environmental surveys, and marine acoustics utilizing the proprietary 360M noise modelling software. The 2021-commissioned Ocean Resolution vessel (80m LOA, DP2) is purpose-designed to deliver all three disciplines simultaneously.

The business operates on a project-based professional services model, delivering turnkey solutions from tender response through data acquisition, processing, interpretation, and reporting. Revenue is generated through direct enterprise sales engagement with no intermediary distribution channels; pricing is quote-based and project-specific with no public disclosure. Gardline relies on its corporate website, industry conference participation, and direct client consultation as its primary marketing channels. The company holds ISO 9001, ISO 14001, and ISO 45001 certifications and is recognized as a member of the East of England Energy Group. As a private subsidiary, it does not publish standalone financial statements; revenue and capital allocation are consolidated within Boskalis's maritime services reporting.

Name

Gardline Group

Legal name

Gardline Limited

Website

https://gardline.com

Company type

Private

Founded year

1969

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Gardline is a UK-based marine survey company providing geophysical, geotechnical, and environmental survey services to offshore wind farm developers, oil and gas operators, government agencies, and academic institutes globally. Operating one of the world's largest permanently mobilised survey vessel fleets, it is a wholly owned subsidiary of Boskalis.

Ownership category

akta.pro rank

Product category

Marine Survey Services

NAICS

Geophysical Surveying and Mapping Services (54136)

SIC

Oil & Gas Field Exploration Services (1382), Oil & Gas Field Services, Nec (1389)

akta.pro primary industry

Seismic & Geoscience Services (Acquisition, Processing, Interpretation) (EUALABAK)

akta.pro secondary industry

Subsea Services & Equipment (Subsea Trees, Umbilicals, Installation, IMR) (EUALABAI)

Keywords

• Marine survey services
• Offshore geophysical surveys
• Offshore geotechnical services
• Marine environmental surveys
• Offshore site investigations

Headquarters

HQ city

Great Yarmouth

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Marine Survey Services: Gardline generates revenue through providing comprehensive marine survey services including geophysical, geotechnical, and environmental surveys to offshore energy companies. Services are delivered as project-based engagements with turnkey solutions covering data acquisition, processing, interpretation, and reporting.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Gardline delivers integrated, turnkey marine survey services for the offshore energy sector, spanning geophysical surveys (HR3D seismic, site investigations, geohazard assessment, UXO, cable and pipeline route surveys, seabed mapping, nearshore), geotechnical services (offshore drilling, seabed sampling, laboratory analysis, vibrocoring and CPT), and environmental services (marine mammal observation, passive acoustic monitoring, environmental surveys, marine acoustics). Services cover data acquisition, processing, interpretation, and reporting, executed using one of the world's largest fleets of permanently mobilised survey vessels.

Product overview

Gardline is a multidisciplinary marine survey company offering an integrated, turnkey portfolio of three core service lines: Geophysical Services (High Resolution 3D Seismic, Site Investigation Surveys, 3D Geohazard Assessment, UXO Surveys, Cable & Pipeline Route Surveys, Seabed Mapping, Nearshore Services), Geotechnical Services (Offshore Geotechnical Drilling, Seabed Sampling, Laboratory Analysis, Vibrocoring & CPT), and Environmental Services (Marine Mammal Observation, Passive Acoustic Monitoring, Marine Environmental Services, Marine Acoustics). The company operates one of the world's largest fleets of permanently mobilised survey vessels and deploys proprietary in-house developed technologies including seismic recording systems, 360M acoustic noise modelling software, and the SOFAR calibrated underwater sound recording system. Services are delivered as integrated, single-platform survey packages combining physical, chemical, and biological data acquisition, with turnkey data acquisition, processing, interpretation and reporting capabilities for the offshore energy sector.

Differentiator

Problem solved

Functional benefit

Products and services

• Survey Vessels Fleet One of the world's largest fleets of permanently mobilised survey vessels used to conduct offshore site investigation surveys for offshore energy and infrastructure projects.
• High Resolution 3D Seismic (HR3D) High Resolution 3D Seismic survey service providing geophysical data for drilling hazard site surveys and effective identification of geohazards including shallow gas.
• Site Investigation Surveys Integrated site investigation survey services for oil and gas majors, wind farm developers, and offshore engineering developments, combining seismic, seabed mapping, geotechnical, and environmental tools.
• 3D Geohazard Assessment Comprehensive 3D geohazard assessment services covering shallow water, shelf break, deep, and ultra-deepwater locations based on seismic data acquisition and interpretation.
• Unexploded Ordnance (UXO) Surveys UXO survey specialist service identifying and mitigating unexploded ordnance risks on the seabed using ScanFish Katria magnetometer surveys and side-scan sonar.
• Cable and Pipeline Route Surveys Seabed mapping and route survey services supporting planning and installation of submarine telecommunication and power cables, from shallow nearshore to full ocean depth.
• Seabed Mapping Offshore seabed morphology charting and geological study services for wind farms and marine construction projects, integrating hydrographic, geophysical, habitat assessment, UXO, and cable route survey capabilities.
• Nearshore Services Hydrographic, geophysical, and environmental surveys in nearshore and coastal environments, delivered via Titan Environmental Surveys using shallow-draft vessels such as MV Titan Discovery.
• Offshore Geotechnical Drilling Complete geotechnical solution using offshore heave-compensated drilling with wireline sampling, in situ testing (CPTU), coring, and an integrated offshore geotechnical laboratory for rapid sample assessment.
• Seabed Sampling Offshore drilling, sampling, and in situ testing services from shallow water to deep ocean, including the proprietary Deep Water Sampler (DWS), vibrocoring, piston coring, box coring, and grab samplers.
• Laboratory Analysis Geotechnical reporting and laboratory testing including core logging, chemical and electrochemical tests, shear strength tests, thermal conductivity, electrical resistivity, and advanced rock sample strength testing.
• Vibrocoring and Cone Penetration Testing (CPT) Geotechnical sampling services using standard and high-powered vibrocoring systems for continuous cores up to 6m below seabed, and seabed penetrometer systems with CPT capacities from 10kN to 200kN for water depths up to 3,000m.
• Marine Mammal Observation (MMO) Professional Marine Mammal Observation services for offshore industry operations, conducted by JNCC and BOEM/NMFS qualified MMOs, providing mitigation, data analysis, and reporting during seismic airgun operations.
• Passive Acoustic Monitoring (PAMS) Passive Acoustic Monitoring systems and trained operators for mitigation during noise-generating offshore operations using JNCC and BOEM approved PAMS systems including the proprietary SOFAR system and autonomous recording units.
• Marine Environmental Services Comprehensive environmental survey services from shallow water estuaries to deep sea, including habitat classification, biotope mapping, environmental characterisation, baseline monitoring, decommissioning surveys, cold water coral mapping, and geochemical surveys.
• Marine Acoustics Underwater acoustics modelling and verification services including real-time SEL and SPL monitoring, sound source verification, and predictive noise modelling using the proprietary 360M software for two-dimensional noise mapping across project lifecycles.
• Ocean Resolution Survey Vessel DP2 multi-role survey vessel (80m LOA, 18m beam) purpose-designed for offshore Oil and Gas and Wind Farm surveys, capable of simultaneous 2D and 3DHR seismic, shallow geotechnical CPT, and environmental sampling operations.

Quantifiable outcome

• Over 11,000 marine survey projects successfully completed
• +4 more outcomes

Named customers4 records

Segments5 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

One partnership is on record.

• Boskalis Group (Parent Company)coreOthersGardline is a wholly owned subsidiary of Royal Boskalis Westminster N.V. (Boskalis). The company operates as part of the Boskalis group, utilizing shared resources, safety programs (NINA), and operational expertise. Boskalis is a global marine services company engaged in dredging, offshore energy, and salvage operations.

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• MMT (Maritime Marine Technology): MMT is a Swedish-based marine surveying company providing geophysical, hydrographic, and UXO survey services to offshore wind and oil & gas clients. It is a closely comparable direct peer with similar service offerings and customer focus.
• Fugro: Fugro is the world's largest independent geo-services company, providing geophysical, geotechnical, and survey services to offshore oil & gas and offshore wind markets. It is the closest direct competitor to Gardline across all three of Gardline's core service lines, with a similarly large global vessel fleet.
• Shearwater GeoServices: Shearwater GeoServices provides marine seismic acquisition and processing services globally. It is a direct peer to Gardline's geophysical survey offerings, particularly for oil & gas exploration customers requiring seismic data acquisition.
• PGS (Petroleum Geo-Services): PGS is a global marine geophysical company specializing in seismic acquisition and imaging services. It competes directly with Gardline's HR3D seismic and geophysical site investigation services for offshore oil & gas exploration customers.
• Ocean Infinity: Ocean Infinity is a marine robotics and survey company operating a fleet of unmanned surface vessels and crewed ships for geophysical, geotechnical and environmental surveys. It is an emerging direct competitor to Gardline in offshore data acquisition, particularly for offshore wind and oil & gas.

Regional players

• N-Sea Group: N-Sea is a European-based subsea service provider specializing in survey, UXO, and IRM services for offshore oil & gas and wind markets. It is a regional peer with comparable offerings but primarily serves Northwest European waters.

Broad incumbents

• Saipem: Saipem is an Italian multinational engineering and construction company serving the oil & gas and offshore renewables industries. While broader in scope, its offshore survey and site investigation capabilities overlap with Gardline's integrated offering.
• TGS: TGS is a leading provider of multi-client geoscience data and subsurface intelligence, with growing presence in marine site characterization for offshore wind. It is a broader incumbent that competes with Gardline in subsurface imaging and offshore wind site investigation.
• Subsea 7: Subsea 7 is a global leader in subsea engineering, construction, and services to the offshore energy industry. While broader in scope, its survey and inspection capabilities overlap with Gardline's subsea installation support work for EPIC contractors.

Others

• Bureau Veritas Marine & Offshore: Bureau Veritas is a global testing, inspection and certification company with marine survey and offshore certification services. While not a direct competitor, it is an adjacent industry participant that intersects with Gardline's environmental and regulatory compliance work for offshore energy clients.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/gardlinelimited

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

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 Gardline Group