Vigilant FLS
for Uncrewed Subsurface

Vigilant FLS – Explore with confidence.

See Vigilant in action

Autonomous Underwater Vehicles such as XLUUVs can greatly enhance their available underwater situational information using Vigilant Forward Looking Sonar (FLS). The provision of real-time navigational and obstacle avoidance data to on-board or remote-control systems allows for safe operation with reduced risk of collisions in uncharted or dynamic environments.

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Vigilant at a glance

  • Safe, risk free operation by removing the risk of underwater collisions and groundings
  • Industry leading range of 1500m hazard detection with data of range, bearing and position in water column
  • Perfect for vessels of all sizes; commercial, military or research
  • Compact design with mounting options to suit both new-build or retrofit
  • Compatible with your existing navigation suite
Vigilant 1500

Sonar Mode Range/ Field of View: 1500 x 120°

3D Mode Range: 600m x 120°

Operational Speed: 25kts

Bottom Mapping Range: 20x Water Depth

Maximum Depth Detection: 100m

Vigilant 1500 FLS

Vigilant 1000

Sonar Mode Range/ Field of View: 1000m x 120°

3D Mode Range: 600m x 120°

Operational Speed: 25kts

Bottom Mapping Range: 12x Water Depth

Maximum Depth Detection: 100m

Vigilant 1000 FLS

Vigilant 600 FLS

Sonar Mode Range/ Field of View: 600m x 120°

3D Mode Range: 600m x 120°

Operational Speed: 25kts

Bottom Mapping Range: 20 x Water Depth

Maximum Depth Detection: 100m

Vigilant 600 FLS

Benefits of Vigilant for your operations


Unrivalled resolution and detail that’s compatible with your existing navigation suite, with the added benefit can be retrofitted to any vessel.


Unique patented technology capable of depth finding at ranges ahead of your vessel in excess of 20 times the prevailing water depth.


Real-time data on poorly charted seabed features and water column obstacles enables AUV reactive navigational autonomy.

Vigilant FLS Overview

Vigilant provides real-time 3D images of the seabed and water column ahead of the vessel. It maintains a history of the entire seabed environment surrounding the vehicle. Vigilant will also provide automated warnings to allow the platform control software to assess and take action to prevent collisions.

Vigilant is our family of long-range, Forward Looking Sonars (FLS). They are compact navigation and obstacle avoidance sonars providing automated alarms warning of objects in the water column out to 1.5 km. They create – with unrivalled resolution and detail – a real-time, easy to interpret 3D terrain map of the seabed and water column ahead, out to 600 m, and down to 100 m water depth.

The Vigilant 1000 and 1500 models consist of a separate sonar projector and receiver whereas Vigilant 600 features a combined projector/receiver design for applications where space is limited.

Seaborne collision avoidance is vital for autonomous ships and an ever-increasing number of uncrewed subsurface vessels in the offshore energy, commercial marine and naval market sectors. Vigilant can be easily integrated into these autonomous platforms. It will provide essential information to autopilots and command and control systems to aid safe navigation and manoeuvres around hazardous obstacles.

Vigilant has two principal operating modes: 3D and SONAR mode, both of which offer a class leading 120 degrees field of view on all range scales. Vigilant’s unique patented technology allows our 3D mode to provide stunning 3D depth imagery further ahead of the platform than any competing system, at ranges in excess of 20 times the prevailing water depth up to a maximum 600 m range and down to 100 m depth. Sonar mode processes the intensity of the acoustic data to extract long-range positional data of objects up to ranges of 1500 m. Data from both modes are used to automatically generate alerts for the operator or supervising system to warn of the presence of a navigationally relevant obstacle. With its history mapping capability, a comprehensive picture of the underwater environment surrounding the vessel is built up. This provides crews and autonomous systems with maximum situational awareness for collision or ground avoidance, tight manoeuvres or backing out of confined areas.

The Vigilant FLS family are designed to be retrofitted to existing vessels and new builds. Comprehensive engineering support and advice is available from Wavefront to support installation and commissioning.

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Why invest in Vigilant FLS?


  • Real-time determination of seabed terrain and under water hazards
  • Historical image display provides comprehensive situational awareness of the subsea environment
  • Easy to configure and operate; no need for sonar experience
  • Overlay charts provide clear context


  • Industry leading field of view 120°
  • Range 600 m in 2D/3D depth modes and 1500 m in sonar mode
  • Optimised operating frequency 70 kHz
  • Operational speed up to 25 knots
  • Class leading bottom mapping range of 20 x water depth
  • Maximum depth detection down to 100 m


  • Receiver size - V1000 & V1500 (H x W x L): 110 x 310 x 401 mm
  • Projector size - V1500 (H x W x L): 578 x 118 x 125 mm
  • Simple TCP/IP data output
  • Seamless switching between Sonar and 2D/3D depth modes, and variable display ranges
  • User defined settings for warnings and automated alarm parameters
  • Electronic Navigational Chart (ENC) overlay (chart licence and permits not included)
  • Full Control and Data interface to enable integration with bridge systems


  • What’s in the box: Projector and Receiver sonar arrays, cable assemblies, power and distribution cabinet, rack mounted marine computer, software
  • Warranty: 1 year return to Wavefront service centre
  • ITAR Controlled: No UK Export
  • UK Export License: Not required

Request access via the form below to receive the following PDFs:

  • Vigilant Ice Keel Detection Capability
  • Assessment of Vigilant Environmental Impact
  • Vigilant FLS Whale Detection Analysis
Vigilant PDF [V pt.I]