Company lists · Data refreshed September 2026
Top 25 Hydrographic survey companies based in the United Kingdom
RevenueBase identified 76 hydrographic survey companies headquartered in the United Kingdom as of September 2026 and tracks 1,031 professional contacts across them, including 420 with verified work emails. Lymington is the largest hub.
This list covers hydrographic survey companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest hydrographic survey companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 545 contacts → | ||||
Partial evidence “Gardline is a best-in-class provider of geophysical, geotechnical and environmental marine surveys.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 74 contacts → | ||||
Partial evidence “EGS International Ltd (EGSi) is part of a leading international group of companies specialising in marine surveys.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 44 contacts → | ||||
Indirect evidence “Marine Contractors specialising in: Marine Civil Engineering and Construction.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 41 contacts → | ||||
Indirect evidence “Coda Octopus is a global leader and specialist in underwater technologies including being the patent holder for the real-time 3D sonar, the Echoscope®.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 41 contacts → | ||||
Partial evidence “Spectrum specialises in the provision of combined marine survey and crew transfer vessel services to the offshore construction industry.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 31 contacts → | ||||
Indirect evidence “Measurement experts who use innovation to understand river functions and provide knowledge to inform projects that reduce flooding and improve natural habitats.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 27 contacts → | ||||
Strong evidence “Aspect Land & Hydrographic Surveys Ltd are one of the UK’s leading independent coastal survey companies, with extensive experience and a proven track record in providing…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 12 contacts → | ||||
Partial evidence “SG Survey are independent marine surveyors providing a first class service, worldwide.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 11 contacts → | ||||
Strong evidence “SEP Hydrographic Limited was established in 2020 to meet the growing demand for a complete land and marine survey solution.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 11 contacts → | ||||
Partial evidence “Macduff Ship Design Ltd are proven industry leaders in the Naval Architecture and Marine Survey sectors, having worked for more than 25 years with owners, operators and shipyards…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 10 contacts → | ||||
Partial evidence “Ultrabeam is a multi-award-winning company specialising in high-definition marine survey and asset inspection.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 10 contacts → | ||||
Partial evidence “Caintech Ltd was first established in August 1988 and worked solely within the offshore Oil sector until May 2005 when we expanded into construction, land and hydrographic…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 10 contacts → | ||||
Indirect evidence “CMS began with a simple mission: to provide the marine industry with precise and dependable data that builds confidence from the seabed up.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 9 contacts → | ||||
Partial evidence “Hydrofix specialises in providing full project lifecycle hydrographic and geophysical support services to the offshore construction industry and service support providers.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 9 contacts → | ||||
Strong evidence “Established in 2020, Ocean Phoenix International Ltd is a specialist Marine and Hydrographic Survey support company which has been set up by Offshore Industry veteran Peter…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 8 contacts → | ||||
Partial evidence “Titan Environmental Surveys Ltd is a multi-disciplinary marine and environmental surveying company.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 8 contacts → | ||||
Partial evidence “Shoreline Surveys Limited is a research company based out of Moreford Hall, Crossways, United Kingdom.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 6 contacts → | ||||
Partial evidence “Randall Surveys LLP is a multi-disciplinary survey practice based in Bures, on the Essex/Suffolk border.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 5 contacts → | ||||
Partial evidence “Swathe Services is a group of leading survey support companies providing highly qualified survey personnel and equipment to marine engineers, contractors and surveyors around the…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 3 contacts → | ||||
Indirect evidence “Zeewarriors is a Marine Specialists company, formed to provide a complete marine service to its customers.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 3 contacts → | ||||
Partial evidence “PicSea is an innovative underwater survey and technology company dedicated to revolutionizing subsea data collection.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 3 contacts → | ||||
Strong evidence “DOHS was founded in 1989, at a time when the offshore hydrographic survey industry was increasing the use of contract staff and our founder Dave Oliver realised that a service…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 3 contacts → | ||||
Partial evidence “South Coast Marine Surveyors can provide surveys for private owners or future purchasers of Yachts and Motor Boats.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 3 contacts → | ||||
Partial evidence “CMS Offshore Ltd owns and operates its own 24m survey vessel which is idea for geotechnical and geophysical surveys, UXO investigations, environmental monitoring, towage, salvage…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 2 contacts → | ||||
Partial evidence “Survey vessel operators” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: hydrographic survey companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names hydrographic survey companies.
- Partial evidence
- Its own public description names part of hydrographic survey companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name hydrographic survey companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 76 hydrographic survey companies based in the United Kingdom
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 420 reachable decision-makers.
Free signup · no credit card
Hydrographic survey companies based in the United Kingdom at a glance
As of Sep 20, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 76 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among hydrographic survey companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United Kingdom whose own description of what they do matches “hydrographic survey companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names hydrographic survey companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among hydrographic survey companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 420 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names hydrographic survey companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many hydrographic survey companies are there based in the United Kingdom?
RevenueBase identified 76 hydrographic survey companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Gardline Limited, headquartered in Great Yarmouth, tops this list with the largest team on record.
Which city has the most hydrographic survey companies?
Lymington leads with 4 headquartered companies, followed by London (3) and Edinburgh (2).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 420 verified decision-maker contacts tracked across these 76 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.
Ready to reach these companies? Verified emails and direct dials for all 76 hydrographic survey companies based in the United Kingdom. Start with a free account, no credit card.
Download this list →Related lists
Hydrographic survey companies by geography
About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Hydrographic survey companies based in Australia
- Hydrographic survey companies based in the Netherlands
- Hydrographic survey companies based in the United States
- AI companies based in the United Kingdom
- Cybersecurity companies based in the United Kingdom
- Manufacturing companies based in the United Kingdom