From the Ops Manual:
Semi-subs, large barges and FSU's ............. 3 deg / 5 m
Large Ships ............................................ 2.5 deg / 4 m
Bow Decks ............................................. 2.0 deg / 3 m
Stern & Amidship .................................... 2.5 deg / 3 m
Oil Tanker, moored buoys.......................... 2.0 deg