Which information determines if a NAVTEX message is to be rejected?

The determination of whether a NAVTEX message is accepted or rejected primarily hinges on the second letter in the message header. This letter designates the type of message being sent—such as maritime safety information, weather reports, or navigational warnings. Depending on the type encoded in this letter, a receiving station may categorize and filter the messages. If the second letter indicates a type of message that the station is not programmed or authorized to receive, then it will reject that message. Thus, this specific piece of information is crucial for the operation of NAVTEX systems in prioritizing and processing relevant maritime communications.