A tug (11) comprising a deck having an aft deck (16), a central deck (12) and a forward deck (15) and a rotatable towing installation (13) disposed on the central deck. The towing installation and central deck are sloping upwards from the aft deck to the forward deck with respect to a horizontal plane. The upward sloping angle (α) of the towing installation is at least 5 degrees. The design provides free towing all around in the horizontal plane in combination with sufficient bow height and buoyancy and in addition below deck space for e.g. additional accommodation.