Section-h: Maritime Safety Information (m.S.I.): Key Topic #53: Navtex-3: Message Format:

53H1 The NAVTEX message header contains the following?

A. The first letter (from A to Z) indicates the NAVTEX transmitting station.

B. A two-digit number (01-99) indicates the NAVTEX message category.

C. Message numbers include a date/time group, along with the transmitting station's numerical ID.

D. None of these answers is correct.

53H2 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?

A. Navigational warnings, meteorological warnings and metrological forecasts.

B. Meteorological warnings, Search and Rescue information and Navigational warnings.

C. Search and Rescue information, navigational warnings and other electronic navaid messages.

D. Search and Rescue information, Meteorological warnings and ice reports.

53H3 How are NAVTEX broadcasts transmitted?

A. NAVTEX is transmitted by commercial coast radio stations following their traffic lists.

B. NAVTEX is transmitted only when an Urgency or Distress broadcast is warranted.

C. Using FEC techniques.

D. No more often than every two hours and should immediately follow the radiotelephone silent periods.

53H4 What determines whether a NAVTEX receiver prints a particular type of message content from a programmed NAVTEX station?

A. The serial number and type of message have already been received but additional printouts are generated to ensure receipt aboard the vessel.

B, The subject indicator has been programmed for rejection by the operator but the message contains a priority override print command.

C. The transmitting station ID covering your area has been programmed for rejection by the operator or has not been previously received.

D. The serial number and type of message has not been previously received or the subject indicator has not been programmed for rejection.

53H5 Which information determines if a NAVTEX message is to be rejected?

A. The second letter (from A to Z) in the header indicating the type of message.

B. Transmitter identity (numerals from 1 to 26 identifying transmitting station within the NAVAREA).

C. The Answerback of the receiving station has not been entered in the NAVTEX receiver.

D. Only messages having a serial number 00 are rejected.

53H6 NAVTEX broadcasts are sent:

A. Immediately following traffic lists.

B. In categories of messages indicated by a single letter or identifier.

C. On request of maritime mobile stations.

D. Regularly, after the radiotelephone silent periods.

Answers: 53H1 - A 53H2 - B 53H3 - C 53H4 - D 53H5 - A 53H6 - B

Section-h: Maritime Safety Information (m.S.I.): Key Topic #54: SafetyNettm -1: Operations:

54H1 Where NAVTEX cannot be feasibly established, what system can be implemented to provide an automated service in coastal waters to receive MSI?

A. AMVER

B. VHF DSC

C. ARQ SITOR (NBDP)

D. SafetyNET^TM

54H2 What action should a GMDSS Radio Operator take when SafetyNET^TM Distress or Urgency messages are received by the vessel's EGC receiver?

A. Aural and/or visual alarms are activated and require manual deactivation.

B. No immediate action is required, as an audible tone will be generated at the beginning and end of the transmission and a paper printout of the message will be generated.

C. No immediate action is required by the operator, since the transmission will be automatically acknowledged by the receiving vessel.

D. A periodic alarm tone will be heard until the radio operator prints the message from the unit's memory.

54H3 What system can provide an automated service in coastal waters where it may not be feasible to establish the NAVTEX service or where shipping density is too low to warrant its implementation?

A. AMVER

B. SafetyNET^TM

C. VHF DSC

D. ARQ SITOR (NBDP)

54H4 Aboard ship, SafetyNET^TM messages can be received by which equipment/methods?

A. VHF DSC on the weather channels.

B. NAVTEX Receiver on 518 kHz or the Tropical Navtex frequency.

C. EGC receiver of the vessel's Inmarsat-C SES.

D. HF SITOR (NBDP) MSI frequencies.

54H5 SafetyNET^TM messages can be received by which of the following shipboard equipment?

A. NAVTEX

B. MF and HF SITOR (NBDP)

C. Inmarsat-C EGC receiver

D. Inmarsat F77 EGC receiver

54H6 Maritime Safety Information is promulgated via satellite through which system?

A. AMVER

B. NAVTEX

C. Inmarsat-M SES

D. SafetyNET^TM

Answers: 54H1 - D 54H2 - A 54H3 - B 54H4 - C 54H5 - C 54H6 - D