Company lists · Data refreshed September 2026

Top 25 Marine surveillance companies based in the United Kingdom

Name: Marine surveillance companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 353 companies tracked

RevenueBase identified 353 marine surveillance companies headquartered in the United Kingdom as of September 2026 and tracks 7,117 professional contacts across them, including 2,496 with verified work emails. London is the largest hub.

This list covers marine surveillance 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

353Companies

7,117Contacts tracked

2,496Verified emails

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The 25 largest marine surveillance companies based in the United Kingdom

Ranked by team size

Top 25 of 353 marine surveillance companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to marine surveillance companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Gardline Limited	Partial evidence	Great Yarmouth, United KingdomHQ checked Sep 20, 2026	501-1,000	545 contacts →
	Partial evidence “Gardline is a best-in-class provider of geophysical, geotechnical and environmental marine surveys.” Source: RevenueBase Database · checked Sep 20, 2026
2	Ambrey	Partial evidence	Hereford, United KingdomHQ checked Sep 20, 2026	51-200	435 contacts →
	Partial evidence “Always On"- We are at the heart of a diverse and interdependent global maritime eco-system.” Source: RevenueBase Database · checked Sep 20, 2026
3	James Fisher And Sons PLC	Indirect evidence	Barrow-in-furness, United KingdomHQ checked Sep 20, 2026	1,001-5,000	403 contacts →
	Indirect evidence “Above, below and beyond the world’s oceans.” Source: RevenueBase Database · checked Sep 20, 2026
4	Briggs Marine	Partial evidence	Burntisland, United KingdomHQ checked Sep 20, 2026	501-1,000	387 contacts →
	Partial evidence “Briggs Marine is a leading provider of marine and environmental services, specialising in port and marine operations, subsea and environmental support and vessel charter.” Source: RevenueBase Database · checked Sep 20, 2026
5	Sperry Marine	Partial evidence	New Malden, United KingdomHQ checked Sep 20, 2026	201-500	279 contacts →
	Partial evidence “Sperry Marine provides the commercial and defence maritime industry with Navigation Solutions that excel in efficiency, reliability and safety.” Source: RevenueBase Database · checked Sep 20, 2026
6	Lloyd's List Intelligence	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	266 contacts →
	Partial evidence “Lloyd’s List Intelligence delivers the trusted maritime data, analytics, and insight that keeps global trade moving.” Source: RevenueBase Database · checked Sep 20, 2026
7	Sulmara	Indirect evidence	Glasgow, United KingdomHQ checked Sep 20, 2026	201-500	241 contacts →
	Indirect evidence “Sulmara is a global seabed intelligence company, capturing and interpreting high-quality subsea data to enable smarter offshore decisions.” Source: RevenueBase Database · checked Sep 20, 2026
8	Pole Star Global	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	183 contacts →
	Partial evidence “Pole Star Global is a maritime intelligence and technology solutions company, focusing on reducing risk and optimising trade efficiency.” Source: RevenueBase Database · checked Sep 20, 2026
9	Orca AI	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	132 contacts →
	Partial evidence “Founded in 2018 by a team of Navy veterans, Orca AI, a maritime tech startup, empowers shipping companies to enhance their operational safety, efficiency, and sustainability…” Source: RevenueBase Database · checked Sep 20, 2026
10	SRT Marine Systems PLC	Strong evidence	Midsomer Norton, United KingdomHQ checked Sep 20, 2026	51-200	129 contacts →
	Strong evidence “SRT Marine Systems PLC is a global leader and innovator in maritime surveillance, intelligence, navigation safety and situational awareness.” Source: RevenueBase Database · checked Sep 20, 2026
11	Spectec	Partial evidence	Manchester, United KingdomHQ checked Sep 20, 2026	51-200	113 contacts →
	Partial evidence “SpecTec is a market-leading maritime technology company specialising in asset management software.” Source: RevenueBase Database · checked Sep 20, 2026
12	Star International	Indirect evidence	Birkenhead, United KingdomHQ checked Sep 20, 2026	51-200	103 contacts →
	Indirect evidence “Star International specialises in keeping vessels safe and compliant.” Source: RevenueBase Database · checked Sep 20, 2026
13	Cathelco	Indirect evidence	Chesterfield, United KingdomHQ checked Sep 20, 2026	51-200	91 contacts →
	Indirect evidence “Cathelco safeguards your fleet by managing biofouling, ensuring corrosion protection, and generating freshwater Our offering: Ultrasonic Antifouling - Cathelco's DragGone™…” Source: RevenueBase Database · checked Sep 20, 2026
14	Ocean Ecology LTD	Partial evidence	Gloucester, United KingdomHQ checked Sep 20, 2026	51-200	76 contacts →
	Partial evidence “Ocean Ecology Limited is a leading marine environmental consultancy specialising in providing survey, technical, data and advisory services to organisations delivering and…” Source: RevenueBase Database · checked Sep 20, 2026
15	Holyhead Towing Co. LTD	Indirect evidence	Holyhead, United KingdomHQ checked Sep 20, 2026	51-200	75 contacts →
	Indirect evidence “Holyhead Towing Company (Est.” Source: RevenueBase Database · checked Sep 20, 2026
16	EGS International	Partial evidence	Bordon, United KingdomHQ checked Sep 20, 2026	51-200	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, 2026
17	Martek Marine LTD	Partial evidence	Rotherham, United KingdomHQ checked Sep 20, 2026	51-200	70 contacts →
	Partial evidence “For over 25 years, Martek Marine has delivered disruptive marine technology that keeps crews safe, optimises vessel performance, and supports sustainable operations at sea.” Source: RevenueBase Database · checked Sep 20, 2026
18	Abpmer	Partial evidence	Southampton, United KingdomHQ checked Sep 20, 2026	51-200	69 contacts →
	Partial evidence “ABPmer is a leading UK marine consultancy, creating sustainable solutions for clients in the marine environment.” Source: RevenueBase Database · checked Sep 20, 2026
19	Film-Ocean	Indirect evidence	Ellon, United KingdomHQ checked Sep 20, 2026	51-200	68 contacts →
	Indirect evidence “Film-Ocean provides innovative subsea solutions to the global offshore energy industry.” Source: RevenueBase Database · checked Sep 20, 2026
20	ACE Aquatec	Partial evidence	Dundee, United KingdomHQ checked Sep 20, 2026	11-50	66 contacts →
	Partial evidence “Ace Aquatec is an award-winning aquaculture technology company specialising in in-water electric stunners; marine mammal protection devices, biomass cameras and sea Lice removal…” Source: RevenueBase Database · checked Sep 20, 2026
21	Seiche	Partial evidence	Holsworthy, United KingdomHQ checked Sep 20, 2026	51-200	59 contacts →
	Partial evidence “Seiche provides marine technology and environmental service solutions for the offshore marine industries.” Source: RevenueBase Database · checked Sep 20, 2026
22	Maritime Craft Services Clyde Limited	Partial evidence	Largs, United KingdomHQ checked Sep 20, 2026	51-200	59 contacts →
	Partial evidence “Maritime Craft Services (clyde) Limited is a Maritime company located in Irvine Rd, Largs, United Kingdom.” Source: RevenueBase Database · checked Sep 20, 2026
23	IDWAL	Indirect evidence	Cardiff, United KingdomHQ checked Sep 20, 2026	501-1,000	57 contacts →
	Indirect evidence “IDWAL is the ship inspection, technology and data business.” Source: RevenueBase Database · checked Sep 20, 2026
24	Benthic Solutions Limited	Partial evidence	Hoveton, United KingdomHQ checked Sep 20, 2026	11-50	49 contacts →
	Partial evidence “Benthic Solutions Limited (BSL) is an independent marine environmental consultancy and survey company offering a broad range of capabilities in survey, analytical, interpretative…” Source: RevenueBase Database · checked Sep 20, 2026
25	Inverlussa Marine Services	Indirect evidence	Isle Of Mull, United KingdomHQ checked Sep 20, 2026	51-200	49 contacts →
	Indirect evidence “Inverlussa is one of the leading workboat operators in the aquaculture industry in Scotland and has experience in the offshore renewables industry.” Source: RevenueBase Database · checked Sep 20, 2026

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: marine surveillance 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 marine surveillance companies.
Partial evidence: Its own public description names part of marine surveillance companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name marine surveillance 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 353 marine surveillance companies based in the United Kingdom

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Marine surveillance companies based in the United Kingdom at a glance

As of Sep 20, 2026

35.1%Verified-email coverage

20.2Average contacts per company

1-10Median size (employees)

12.2%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

185

11-50

109

51-200

201-500

501-1,000

1,001-5,000

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 353 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 marine surveillance 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 “marine surveillance 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 marine surveillance 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 marine surveillance 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, 2,496 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.

Marine surveillance companies by metro

Marine surveillance companies in London43

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 marine surveillance 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 marine surveillance companies are there based in the United Kingdom?

RevenueBase identified 353 marine surveillance 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 marine surveillance companies?

London leads with 43 headquartered companies, followed by Aberdeen (10) and Bristol (7).

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 2,496 verified decision-maker contacts tracked across these 353 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.

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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.