The vessel will work at various fields in the Danish North Sea from September 2016.
The overhaul involves construction of a new 142-room, 560-ton accommodation block to supplement the existing quarters.
Maersk Guardian will remain in Frederikshavn for the program. Following completion of the new block in Gdansk it will sail to Frederikshavn in August, with installation due to be completed around two weeks after its arrival.
Maersk Guardian, built in Japan in 1986, is designed for year-round service in the North Sea. It has a leg length of 157 m (515 ft).
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