Company lists · Data refreshed September 2026

Top 25 Hydrographic surveying companies based in the United States

Name: Hydrographic surveying companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 129 companies tracked

RevenueBase identified 129 hydrographic surveying companies headquartered in the United States as of September 2026 and tracks 1,839 professional contacts across them, including 581 with verified work emails. Houston is the largest hub.

This list covers hydrographic surveying companies headquartered in the United States, 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

129Companies

1,839Contacts tracked

581Verified emails

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The 25 largest hydrographic surveying companies based in the United States

Ranked by team size

Top 25 of 129 hydrographic surveying companies based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to hydrographic surveying 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	Saexploration	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	201-500	521 contacts →
	Indirect evidence “SAExploration offers a full range of geophysical ground acquisition services from design, prospecting, drilling, recording and analysis of field quality, as well as mobilization…” Source: RevenueBase Database · checked Sep 20, 2026
2	Benthic - Utec	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	51-200	115 contacts →
	Indirect evidence “Benthic is a global leader in offshore marine geotechnical investigation, survey, analysis and design.” Source: RevenueBase Database · checked Sep 20, 2026
3	Tdi-Brooks	Indirect evidence	College Station, TX, United StatesHQ checked Sep 20, 2026	51-200	107 contacts →
	Indirect evidence “TDI-Brooks is a 27-year-old research and service company specializing in geotechnical and offshore survey projects; multi-disciplinary oceanographic and environmental projects…” Source: RevenueBase Database · checked Sep 20, 2026
4	Gahagan And Bryant Associates, INC	Indirect evidence	Tampa, FL, United StatesHQ checked Sep 20, 2026	51-200	74 contacts →
	Indirect evidence “Gahagan & Bryant Associates, Inc.(GBA) is a unique engineering firm that specializes in providing consulting and engineering services for a variety of projects, including port…” Source: RevenueBase Database · checked Sep 20, 2026
5	Alpine Ocean Seismic Survey, INC	Indirect evidence	Norwood, NJ, United StatesHQ checked Sep 20, 2026	51-200	55 contacts →
	Indirect evidence “Alpine are experts in acquiring, analyzing, and interpreting data from marine offshore, nearshore, and freshwater environments.” Source: RevenueBase Database · checked Sep 20, 2026
6	Makai Ocean Engineering, INC	Indirect evidence	Waimanalo, HI, United StatesHQ checked Sep 20, 2026	11-50	46 contacts →
	Indirect evidence “Makai Ocean Engineering was founded in 1973 as a diversified ocean engineering company focused on providing design engineering and development services to a broad range of…” Source: RevenueBase Database · checked Sep 20, 2026
7	Terrasond - Utec	Partial evidence	Palmer, AK, United StatesHQ checked Sep 20, 2026	51-200	38 contacts →
	Partial evidence “Provider of professional surveying services throughout the world safely, effectively, and economically.” Source: RevenueBase Database · checked Sep 20, 2026
8	Oars Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	37 contacts →
	Indirect evidence “Marine geoscience consulting group specializing in survey project consulting, data management, and the provision of experienced field personnel in support of offshore energy…” Source: RevenueBase Database · checked Sep 20, 2026
9	3d At Depth	Indirect evidence	Longmont, CO, United StatesHQ checked Sep 20, 2026	11-50	36 contacts →
	Indirect evidence “3D at Depth is the world’s only true commercial deep-water LiDAR technology company.” Source: RevenueBase Database · checked Sep 20, 2026
10	Ocean Surveys, INC	Strong evidence	Old Saybrook, CT, United StatesHQ checked Sep 20, 2026	11-50	34 contacts →
	Strong evidence “OSI is a highly responsive hydrographic, geophysical, physical oceanographic surveying and sediment sampling firm staffed with scientists, hydrographers, engineers, and…” Source: RevenueBase Database · checked Sep 20, 2026
11	Inspire Environmental, A Venterra Group Company	Indirect evidence	Newport, RI, United StatesHQ checked Sep 20, 2026	11-50	33 contacts →
	Indirect evidence “INSPIRE’s skilled team of scientists and analysts is dedicated to making science understandable by applying innovative technology for effective solutions.” Source: RevenueBase Database · checked Sep 20, 2026
12	Seafloor Systems, INC	Indirect evidence	Shingle Springs, CA, United StatesHQ checked Sep 20, 2026	11-50	33 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
13	Fathom Resources LLC	Indirect evidence	New Bedford, MA, United StatesHQ checked Sep 20, 2026	11-50	31 contacts →
	Indirect evidence “Fathom Resources (Fathom), is a marine service provider established in 2002 with offices located in New Bedford, Massachusetts and Middletown, Rhode Island.” Source: RevenueBase Database · checked Sep 20, 2026
14	Seaside Engineering And Surveying, LLC Seas	Partial evidence	Baker, FL, United StatesHQ checked Sep 20, 2026	11-50	27 contacts →
	Partial evidence “Seaside Engineering and Surveying LLC (SEAS) is a full-service civil engineering and geospatial company where trust, accuracy and attention to detail is the standard of excellence…” Source: RevenueBase Database · checked Sep 20, 2026
15	Darkocean	Partial evidence	Newark, DE, United StatesHQ checked Sep 20, 2026	51-200	26 contacts →
	Partial evidence “Founded in 2023, Darkocean delivers AI-powered geo-intelligence and cutting-edge robotics to transform offshore hydrography, geophysical and seismic surveys.” Source: RevenueBase Database · checked Sep 20, 2026
16	Berger Geosciences, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	23 contacts →
	Indirect evidence “Established in 2007, Berger Geosciences, LLC.” Source: RevenueBase Database · checked Sep 20, 2026
17	Geodynamics LLC	Indirect evidence	Newport, NC, United StatesHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “Geodynamics is officially NV5 Geospatial, make sure to follow @NV5Geospatial to learn more about our hydrospatial and marine solutions.” Source: RevenueBase Database · checked Sep 20, 2026
18	Tcarta	Indirect evidence	Denver, CO, United StatesHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “TCarta is the world's foremost supplier of bathymetric data for near-shore areas around the world.” Source: RevenueBase Database · checked Sep 20, 2026
19	4d Nav, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	20 contacts →
	Indirect evidence “We are a premier survey/engineering software development and consulting company specializing in offshore energy sector.” Source: RevenueBase Database · checked Sep 20, 2026
20	ZUPT	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	19 contacts →
	Indirect evidence “Zupt provides the technology, offshore expertise, and data needed to execute critical offshore operations with confidence and reduced risk.” Source: RevenueBase Database · checked Sep 20, 2026
21	Chesapeake Technology, INC	Indirect evidence	Los Altos, CA, United StatesHQ checked Sep 20, 2026	1-10	18 contacts →
	Indirect evidence “Chesapeake Technology is a leader in ocean geophysical and seafloor mapping solutions.” Source: RevenueBase Database · checked Sep 20, 2026
22	Echo81	Partial evidence	Hartwell, GA, United StatesHQ checked Sep 20, 2026	11-50	16 contacts →
	Partial evidence “ECHO81 is a US-based distributor for hydrographic survey equipment and marine instrumentation offering sales, rentals, installations, and training.” Source: RevenueBase Database · checked Sep 20, 2026
23	KDM Meridian	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “KDM MERIDIAN….” Source: RevenueBase Database · checked Sep 20, 2026
24	JOA Surveys	Partial evidence	Anchorage, AK, United StatesHQ checked Sep 20, 2026	11-50	16 contacts →
	Partial evidence “JOA Survey's LLC is an Alaska based surveying company specializing in tides, water level measurement, vertical datums and geodetic networks.” Source: RevenueBase Database · checked Sep 20, 2026
25	Coastal Systems International, INC	Indirect evidence	Coral Gables, FL, United StatesHQ checked Sep 20, 2026	51-200	16 contacts →
	Indirect evidence “Coastal Systems International, Inc.(Coastal Systems) has an established reputation for providing solutions to complex projects in the coastal/waterfront environment.” 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: hydrographic surveying 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 surveying companies.
Partial evidence: Its own public description names part of hydrographic surveying companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hydrographic surveying 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 129 hydrographic surveying companies based in the United States

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Hydrographic surveying companies based in the United States at a glance

As of Sep 20, 2026

31.6%Verified-email coverage

14.3Average contacts per company

1-10Median size (employees)

10.1%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 129 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 surveying 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 States whose own description of what they do matches “hydrographic surveying 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 surveying 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 surveying companies, and records with no verified work email. Companies headquartered outside United States 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, 581 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 surveying 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 surveying companies are there based in the United States?

RevenueBase identified 129 hydrographic surveying companies headquartered in the United States 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?

Saexploration, headquartered in Houston, tops this list with the largest team on record.

Which city has the most hydrographic surveying companies?

Houston leads with 13 headquartered companies, followed by Seattle (5) and Charleston (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 581 verified decision-maker contacts tracked across these 129 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.