Which messages are mandatory to be received and should not typically be rejected or disabled by the operator of a NAVTEX receiver?

The correct answer identifies messages that are crucial for the safety of navigation and operational integrity at sea. Navigational warnings, meteorological warnings, and Search and Rescue (SAR) information are mandatory messages that all vessels must receive through NAVTEX, a component of the Global Maritime Distress and Safety System (GMDSS).

Navigational warnings provide essential updates on obstacles, and hazards to navigation, ensuring that vessels can avoid dangerous areas. Meteorological warnings are vital for informing mariners about severe weather conditions that could affect their voyage and safety. SAR information gives operators critical data related to ongoing search and rescue operations, which is particularly important in emergencies or distress situations.

These messages play a fundamental role in ensuring mariners have the necessary information to make informed decisions and maintain safety at sea. Thus, operators should not reject or disable these messages as they are vital for the safe operation of vessels.