Section 191

by violence, threat or intimidation, hinders or interferes with or otherwise obstructs the master or an officer of a ship in performing his duty;

or

resists or wilfully obstructs, assaults, molests or otherwise intimidates a person who is carrying out or exercising any duty, function, right or power imposed on him by this Order, shall be guilty of an offence.

Misleading officer, refusal to answer questions, produce documents etc.