THV Alert


Trinity House’s Rapid Intervention Vessel (RIV), ALERT, delivered in 2006, has been designed with buoy handling, wreck marking, towing and multibeam and side scan hydrographic surveying capability.

At 39.3 metres long, she is fitted with a range of high specification survey equipment and to the highest and most modern technical standards. With DP1 dynamic positioning, a service speed of 15 knots and a maximum speed of 17 knots, ALERT will be deployed primarily to cover the southeast coast where she will be able to respond rapidly to any maritime incident.

In addition, ALERT can be utilised as a research platform with her large working deck that can be used for deployment of scientific equipment and sampling work. Available 24/7 with accommodation for an additional 5 people, ALERT is a state of the art vessel that can be utilised for a wide range of projects at very competitive rates including:

  • hydrographic surveys including bathymetry, side scan, sonar and wreck investigations
  • aids to navigation deployment, maintenance, repair and examination
  • research platforms for deployment and recovery of scientific equipment
  • sampling projects
  • marine hazard search and marking
  • lifting, towing and accurate positioning of marine equipment
  • recovery and re-establishment of off-station aids to navigation
  • sea trials of electronic and specialty equipment
  • helicopter support
  • safety boat assignments
  • guard duties for cable and pipe laying projects

Build Standard

Lloyds Register @100 A1 SSC Workboat G4@ Lloyds Machinery Certificate, Unmanned Machinery Space Certificate, Machinery Condition Maintenance, Lloyds Environmental Policy, Lifting Appliance and Dynamic Positioning to CM Standard. Complies with requirements for UK MCA Class V111 vessel.

Download the full specification (pdf) >>

THV Alert Video

Watch a video of THV Alert in action >>