THE MARINE INSTRUMENT ( NAVTEX RECEIVER )
FROM EDITOR'S DESK :
I have put in all my efforts to provide the details of this instrument in very simplified language.
Also, I have endeavored to put in the details of the usage of this instruments on board a ship along with its installation requirements.
I hope this information will be of great importance to the visitors, particularly to the marine personnel's and nautical students.
You are kindly requested to pass your suggesations and comments directly to me.
Thanks & Regards
MARINE NAVTEX RECEIVER
THE MARINE NAVTEX RECEIVER :
MARINE NAVTEX RECEIVER :-
NAVTEX RECEIVER is a simple , reasonable and cost effective but sophesticated medium of receiving the telex messages. It is particularly used for receiving MSI ( Maritime Safety Information's ) on board a ship .The Navtex receiver machine is fitted with a Printer on board ships which immediately starts printing the received messages , thence putting no burden on the user for the setting up of printer every time a message is received.
This type of reception facility is called Narrow Band Direct Printing (NBDP) OR Telex Over Radio ( TOR).
Navtex receiver is fixed or tuned to receive the telex messages or MSI's on the following frequencies.
- 518 KHz ( messages in International English Language )
- 490 KHz ( messages in the national language )
- 4209.5 KHz ( this frequency might be used in some tropical regions )
These MSI or NAV WARNINGS ( Navigational Warnings ) are transmitted by the transmitting stations and Navarea Coordinator's of the concerned NAV-AREA.
For the purpose of simplification of station identification and identification of message type and it priority , the whole world is divided in to 18 NAVAREA / METAREA. (INDIA- falls under Navarea /Metarea - VIII )
In one Navarea there may be 24 stations , segregated in four groups . Each station has a 60 minutes transmission time allotted in one day , for transmission of MSI / NAVWARNINGS / METWARNIGS etc.
Receiver of the Navtex messges , by virtue of his instruments capabilities has the ability to select or reject the wanted or unwanted transmission station or message types. Certain type / category of messages can not be rejected by user, such as :
- NAV WARNINGS
- MET WARNINGS
- DISTRESS MESSAGES
- SEARCH AND RESCUE MESSAGES.