Witherby Seamanship International Ltd, is a specialist publisher of marine training, reference and regulatory materials, providing the finest books and publications to the shipping industry.

Seamanship International most notably publishes the International Safety Guide for Oil Tankers and Terminals (ISGOTT). It is a general industry recommendation that a copy of ISGOTT is kept and used onboard every tanker and in every terminal so that there is a consistent approach to operational procedures and shared responsibilities for operations at the ship/shore interface.