What means are used to prevent the reception of unwanted broadcasts by vessels utilizing the NAVTEX system?

The correct option highlights an important feature of the NAVTEX system, which is designed to provide maritime safety information. By programming the receiver to reject certain stations and message categories, vessels can filter out irrelevant information and focus only on the broadcasts that are pertinent to their specific needs and navigation area. This selective filtering reduces interference from unwanted broadcasts and ensures that the crew receives timely and relevant safety information.

This capability enhances the efficiency of information management onboard and allows for better situational awareness while navigating. Properly configuring the receiver minimizes the risk of missing critical broadcasts among the noise of less relevant transmissions.

The other choices do not effectively address the issue of unwanted broadcasts in the context of NAVTEX. Operating the receiver during specific hours may not impact the reception of unwanted broadcasts, as signals can still be picked up, potentially leading to unnecessary distractions. Coordinating reception with published broadcast schedules may help in organizing information but does not inherently filter out unwanted stations or message categories. Lastly, automatic receiver de-sensitization during night hours could result in missed important information when it’s needed most, rather than preventing unwanted broadcasts.