Mammoet Maritime bought the IJsselstroom in August 2009, after which the ship underwent a refit, for which Hoekman Shipbuilding was responsible, between November 2009 and March 2010.

In the course of the refit the panelling, the main engines, the electrical installation and the whole of the nautical installation were among the items replaced. Since the Zephyrus has a 30-mile certificate, it will be used for all towing activities both on the inland waterways and in the coastal waters.

The Zephyrus’s specifications are as follows:

Lenght o.a.	19,50 m
Breadth o.a.	6,00 m
Mean Draught	2,54 m
Propulsion	2 x 486 hp
Bollard Pull	15 Te
Max. speed	11 knots
Airdraft	6,00 m
Draft min – max	2,00 – 2,40 m
Displacement	150 Te
Bunker Capacities	Fuel 23,5 m3 Fresh Water 18 m3 Sewage 2,3 m3 Sludge 2,0 m3
Callsign / Flag	PBNT / Dutch
Navigation Equipment	Radar SBB Radio + DSC-2x VHF=DSC Satellite Telephone Compass-Autopilot GPS Navtex Echo Sounder – Weatherfax
Deck Equipment	Hydraulic Crane 10 Te/m Towing Winche(single drum) 16/35 Te Capstander 4Te Coupling Winches 2 pc. Electric Coupling Winches 2 pc. Hand
Accommodation	5 Persons
Classification	BV Ix Hull.Mach, Tug unrestricted nav. NSI 30 miles