NAVTEX is a navigational telex system used to broadcast Maritime Safety Information (MSI) such as navigational and meteorological warnings and search and rescue information. NAVTEX stations transmit MSI over radio frequencies of 518 kHz and 4209.5 kHz, with a range of up to 250 nautical miles. Important message types include navigational warnings, meteorological warnings, search and rescue information, and additional navigational warnings. If the NAVTEX system fails, MSI can be received on 4209.5 kHz using NBDP and a printer.

1. NAVTEX
1. What is the use of NAVTEX?
To receive MSI
2. What is NAVTEX?
Navigational telex
3. Who broadcasts the MSI?
From different information providers:
Hydrographic office, Meteorological office, RCC
To NAVTEX stations
NAVTEX stations broadcast MSI
4. What is the range of NAVTEX?
Up to 250 NM
5. What is MSI?
Maritime Safety Information
6. What are the frequencies of NAVTEX?
518 KHz – ENGLISH 490 KHz and 4209.5 KHz – REGIONAL LANGUAGE
7. What is the power output of NAVTEX?
No power out put. It is a receiver
8. What is the emission?
F1B
9. What type of aerial is used?
Active aerial (pre tuned amplifier at the base of the aerial)
10.What types of messages are important?
A, B, D, and L
11.What type of messages can not be deselected?
A, B, D and L
GMDSS VASU PH: 09841852069/096299 80476 e mail ID: vasurc@gmail.com

2. 12.How do you select messages?
See procedures
13.How do you select the stations?
See procedures
14.Which publication do you refer?
Refer ALRS VOLUME 5 or 3
Or
ITU list of radio determination and special service stations
15.If NAVTEX is failure, how will you receive MSI?
Switch on MF/HF transceiver, tune on 4209.5 KHz,
NBDP and printer ON
16.In sea area A3, how do you receive MSI?
Through safetyNET/EGC
17.What is the alternate for NAVTEX?
EGC
18.What is the header code and what does it indicate?
Phasing signal for 10 seconds
It activates the NAVTEX receiver from the mute level
19.What do you receive in NAVTEX?
Phasing signal for 10 seconds
ZCZC – starting code (beginning of message)
B1 (A-Z) – station ID
B2 (A-Z0 – type of message
B3 B4 – serial numbers (00-99)
Message – main message
NNNN – termination code (end of message)
GMDSS VASU PH: 09841852069/096299 80476 e mail ID: vasurc@gmail.com

3. 20.What is the station identification?
A – Z
21.What is the message identification?
A – Z
22.How many METAREAS are there?
16
INDIA – METAREA VIII
23.What is METAREA?
Navigable water areas are subdivided for the purpose of MSI
BROADCASTS
24.Message identification
A – navigational warning
B – meteorological warning
D – search and rescue information/piracy armed robbery
E – meteorological forecasts
F – pilot message
G – AIS message
L – additional navigational warning
M-Y – not used
Z – no message on hand
What are the mandatory messages?
A, B.D and L
Important feature:
If the incoming messages are repeated, it will not be printed.
Messages are identified with the serial numbers.
Except serial number 00
00 is SAR message
GMDSS VASU PH: 09841852069/096299 80476 e mail ID: vasurc@gmail.com