Subelement F: Maritime Safety Information (M.S.I.)— Topic :
Question 39F1
Element 7R (GMDSS-RO)The NAVTEX message header contains the following?
Explanation
NAVTEX messages follow a specific header structure to identify the sender and content. The initial character in a NAVTEX message header, represented as B1, is a single letter (from A to Z) that designates the specific transmitting station. This allows receiving equipment to identify the origin of the message.
Option A is incorrect because the two-digit number in the header (B3B4) represents a sequential serial number assigned to each message by that station within a given category, not the category itself. The message category (e.g., navigational warning, meteorological forecast) is indicated by the second letter (B2).
Option B is incorrect as the standard NAVTEX message header (B1B2B3B4) does not include a date/time group or a numerical ID for the transmitting station; the station is identified by a letter. Date/time information is typically contained within the message body.
Related Questions
38F5 What statement is true regarding the control the operator can exercise over the NAVTEX receiver's operation?38F6 Which messages are mandatory to be received and should not typically be rejected or disabled by the operator of a NAVTEX receiver?39F2 If the Inmarsat-C terminal is inoperative but the vessel remains within NAVTEX coverage -- which of the following message categories should not be disabled by the GMDSS Radio Operator?39F3 How are NAVTEX broadcasts transmitted?39F4 What determines whether a NAVTEX receiver prints a particular type of message content from a programmed NAVTEX station?