Norwegian owner Mokster Shipping has announced charters for four OSVs.

The 4,900-dwt Stril Polar (built 2012) and Stril Orion (built 2011), both platform supply vessels (PSVs), have secured three-month contract extensions from Aker BP.

The 5,300-dwt PSV Stril Mar (built 2016) will service a DEA exploration well at Graspett, an area in licence 721 of the Barents Sea.

The campaign will start in late August and is estimated to last about 40 days.