How do I read NAVTEX messages?
Going section-by-section, the message can be explained as follows; Line 1 – ZCZC indicates the start of a message. F indicates the geographic area and A60 indicates the ‘subject’ of the message. For example, ‘A’ classifies the message as a ‘Navigational Warning’.
Where does the NAVTEX receive its messages from?
The Navtex station sends these message on a designated frequency and we receive it on board if we are in range of that navtex station. Navtex uses frequency 518 KHz for transmitting messages in english. Navtex uses another frequency 490 kHz for transmitting messages in local language.
What are the information we can get from NAVTEX?
It automatically receives Maritime Safety Information such as Radio Navigational Warnings, Storm/Gale Warnings, Meteorological Forecasts, Piracy Warnings, Distress Alerts, etc. (full details of the system can be found in IMO Publication IMO-951E – The NAVTEX Manual).
What are the message format and its contents of NAVTEX?
In the NAVTEX message transmission format: ZCZC indicates the start of the message. The B1 character is a letter (A-Z) identifying the transmitter coverage area – NAVTEX CRS identifier. The B2 character is a letter (A-Z) for each message type.
What are NAVTEX messages?
NAVTEX, an acronym for navigational telex (navigational text messages) is a device used on-board the vessels to provide short range Maritime Safety Information in coastal waters automatically. It can be used in ships of all types and sizes.
What mode is NAVTEX?
NAVTEX (Navigational Telex) is an international automated service for delivery of meteorological and marine safety information to ships. These broadcasts are sent with the SITOR collective B-mode (Also known as AMTOR-B or AMTOR-FEC), using the CCIR 476 character set.
What is the reception mode of NAVTEX?
NAVTEX is an information system for transmitting MSI (Maritime Safety Information, that are navigational and meteorological warnings, meteorological forecasts, and other urgent safety-related messages) and automatic reception of MSI by means of narrow-band direct-printing telegraphy.
What system is a NAVTEX message transmitted?
NAVTEX message format. NAVTEX messages are transmitted using binary frequency-shift keying (BFSK) at 100 bit/s and a 170 Hz frequency shift. The characters are encoded using the 7-bit CCIR 476 character set and basic error detection is enabled by employing forward error correction (FEC).
What kind of messages of information were send via NAVTEX and EGC?
NNNN: This indicates the end of the message. The characters B3 and B4 are used by receivers to keep already received message from being repeated. have been permanently withdrawn. Every Navtex message has information within the message header.
What are the message categories for NAVTEX?
The message category is used to classify the nature of each NAVTEX message. Of particular note are message types ‘D’ (search and rescue), ‘A’ and ‘L’ (navigational warnings) and ‘E’, ‘B’ and ‘C’ (meteorological warnings).
What is NAVTEX used for?
NAVTEX (NAVigational TEleX), sometimes styled Navtex or NavTex, is an international automated medium frequency direct-printing service for delivery of navigational and meteorological warnings and forecasts, as well as urgent maritime safety information (MSI) to ships.
Is NAVTEX part of Gmdss?
The area covered by Navtex can extend as far as 400 nautical miles from the broadcast station. A NAVTEX receiver onboard prints out navigational and meteorological warnings and forecasts as well as urgent Marine Safety Information to ships. It forms a vital element of the Global Maritime Distress Safety System (GMDSS).