RV Coastal Guardian is a dive support vessel which is owned and operated by Shearwater Marine Services of Dunoon.

The follow on ships constructed were the Sea Vigil based on the South Coast, Coastal Guardian for the River Mersey and Water Guardian, based on the North East Coast, but spent some time in the Bristol Channel while the University of Plymouth chartered the Vigilance.

[1] As of September 2013 Coastal Guardian is based in Weymouth under new ownership working commercially as a survey/diving vessel primarily in support of The Shipwreck Project.

Water Guardian is now owned by MPM North West in Maryport Cumbria, renamed Susan H and refitted in April 2014 the vessel is available for survey and dive hire.

Coastal Guardian is now owned and operated by Shearwater Marine Services in Dunoon, mainly used as diving support vessel