Charterers in Norway have resorted to fixing anchor handling tug supply (AHTS) units to perform supply duties because platform supply vessels in the region have sold out, according to brokers.

Four AHTS vessels have been fixed in the past few weeks to perform supply duties in Norway, according to a report from offshore supply shipbroker Westshore.

"The use of AHTSs for supply duties is a historical sign of an undersupplied PSV market, which we last frequently witnessed in 2014," Westshore commented.