Question 39F4

NAVTEX receivers employ sophisticated filtering to ensure only relevant and new information is printed. A message is printed if: 1. **It has not been previously received:** Each NAVTEX message carries a station ID, message type, and a two-digit serial number. The receiver logs messages by this unique combination. If a message with the same station, type, and serial number has already been received, it will generally not be printed again to avoid redundancy and save resources. 2. **Its subject indicator has not been programmed for rejection:** NAVTEX messages are categorized by subject indicators (e.g., 'A' for navigational warnings, 'B' for meteorological warnings). Operators can program their receivers to accept or reject specific subject types. If the message's subject indicator is set to be received (i.e., not rejected), it will be considered for printing. Therefore, option B is correct because if a message is new (not previously received) AND its subject indicator is configured for acceptance, it will be printed. Option A is incorrect because receivers are designed *not* to print messages already received. Option C is incorrect because if a subject indicator is programmed for rejection, the message usually won't print, regardless of priority, unless it's a critical distress message (D), which often overrides filtering. Option D is incorrect as filtering is primarily by message content type and serial number, not typically by rejecting an entire transmitting station's output if it's within range.