Hydrographic Surveyors
Fenn Enterprises is a hydrographic survey specialist based in Washington state, specializing in sidescan sonar surveys, ROV operations, and derelict fishing gear recovery across Puget Sound and the broader Salish Sea. It operates two specialized survey vessels - a 44-foot aluminum vessel and a 24-foot trailerable skiff - outfitted with sidescan sonar, multibeam sonar, sub-bottom profilers, and ROVs. Fenn Enterprises also manufactures custom marine survey equipment through its Sea Gear brand, including sidescan towfish and winches, and has provided sidescan sonar training for international organizations including the World Wildlife Fund.
Sidescan sonar and multibeam sonar surveys of seafloor and underwater environments, including sub-bottom profiling and acoustic tracking.
High-resolution acoustic imaging to map the seafloor and locate underwater objects.
Bathymetric mapping of underwater topography.
Acoustic profiling to image sediment layers beneath the seafloor.
Underwater tracking and positioning utilizing USBL systems.
Remote operated vehicle services featuring unoccupied, highly maneuverable submersibles linked by umbilical cables to support deep-water investigations.
Visual and sonar-based inspections of deep-water structures and equipment.
High-definition underwater video recording with specialized lighting systems in depths up to 1,000 feet.
Targeted retrieval of equipment and marine debris from depth utilizing ROV manipulators.
Survey and environmental removal of lost fishing nets and crab pots from marine habitats using sonar detection and specialized dive teams.
Location and removal of abandoned crab pots to restore marine ecosystems and release trapped marine life.
Systematic retrieval of abandoned commercial fishing nets to clear marine habitats.
Diving operations supported by surface-supplied breathing air for heavy underwater recovery tasks.
Field training workshops covering sidescan sonar operation, ROV operations, and specialized underwater recovery protocols.
Practical instruction on executing sonar surveys, scanning in currents, and target identification.
Hands-on instruction in deploying and maneuvering remote operated vehicles for deep-water recoveries.
Methodological workshops on surveying, cataloging, and recovering abandoned fishing gear safely.
Design and fabrication of high-performance marine instrumentation and deployment systems under the Sea Gear brand.
Design and fabrication of lightweight, portable, and heavy-duty 12VDC electric winches for marine surveying.
Manufacturing of custom aluminum and stainless steel, single and dual frequency sidescan sonar towfish.
Marine · Natural Resources · Environmental & Remediation · Federal
Port Susan and Similk Bay, WA · Environmental & Remediation · 2021
Sidescan sonar surveys followed by derelict crab pot recovery in Port Susan and Similk Bay, recovering hundreds of pots and releasing live Dungeness crab.
Puget Sound, WA · Federal · 2020 · Client: NOAA Fisheries
Recovery and redeployment of 34 NOAA Fisheries hydrophones using a Phantom 2+2 ROV in water as deep as 948 feet.
Seattle, WA and Germany · Natural Resources · 2019 · Client: World Wildlife Fund
Multi-session training workshops for World Wildlife Fund teams covering sidescan sonar operation, ROV use for deep net recovery, and ghost gear survey protocols.
Mukilteo, WA · Natural Resources · 2019
Utilized a Phantom ROV to perform deep-water shrimp pot target surveys to film targets for rock fish presence and recover pots for biological evaluation.