Offshore vessel that handles MODU anchors during rig moves and supplies installations with deck cargo, mud, water, fuel.
Regulatory detail & full definition
Distinguished from PSV by the heavy stern winch and large open aft deck for anchor work. Bollard pulls 100-300 tonnes for towing rigs. DP-2 standard. Crewed by master, chief mate, two engineers, plus deck crew. Hired on day-rate; spot market quoted in OSV indices.