The North Sea OSV market has spiked due to a break in harsh winter weather boosting fixing activity.
The 4,200-dwt platform supply vessel (PSV) NAO Power (built 2013) was booked by Maersk Oil at £25,000 ($33,400) per day over four days, brokers said.
And a SolstadFarstad ship was fixed at £15,000 earlier on Monday.
This compares to a low of £5,750 last week.