VOS communication procedures
|The aim of the present page is to describe the methods used by each NMS's to send the data of their VOS onto the GTS. Notice that you can read/update the wiki pages which are more especially devoted to a particular communication system or procedure such as Argos, Inmarsat, Iridium, Meteosat, Code 41 procedure, etc.|
(Updated on May 2009)
- One conventional ship reporting emails through Inmarsat-F (TBWFR04)
- One conventional ship reporting half compressed data through Inmarsat-C Code 412 F (TBWFR04)
- About 50 Batos AWS reporting compressed data through Inmarsat-C Data Report service (BATFRxx)
- 7 Minos stations reporting through Argos (won't be replaced) (MINFRxx)
German VOS send their observations via INMARSAT-C and Special Access Code 41.
Some ships transmit their observations via Globe Wireless E-Mail. In this case DWD is directly invoiced by the provider.
The automatic MILOS systems of DWD are equipped with DCP and send via METEOSAT hourly.
When E-SURFMAR sttarted, most ships were using TurboWin and sent their messages via Inmarsat-C with Code-41 to the nearest LES. Since, more and more are using email. In 2010(?), KNMI evaluated the Half Compression method on two conventional VOS using TurboWin 4.5. At the end of 2011, they started a systematic deployment of the technique on their VOS with TurboWin 5.0. The Half Compression technique requires the set up of new Short Access Code (SAC) at Inmarsat-C communication providers (e.g. Stratos, Vizada...).
- Example of registration necessary to set up a new SAC
- Procedure on Dutch VOS
- Brief user instructions on Dutch VOS
Most vessels recruited by SMHI use a dedicated telex link reserved for SYNOPs in such a way that the SYNOPs automatic are transmitted onto the GTS. They normally send the SYNOPs by Inmarsat-C without using code 41. SMHI had so big problems with the communication authorities when using code 41 via Inmarsat-C that it was decided to let the observers send an invoice on sent SYNOPs to SMHI instead. However the Shipping Companies or its operators never or very seldom do. It seems they accept the costs as a part in the normally used Weather Routing Service.
The majority of Selected VOS send their observations via Inmarsat-C Special Access code 41 using the ships GMDSS Sat C systems ( although two coastal ships, which are not required to have Sat C, have been fitted with dedicated sat C terminals by the Met Office).
The manaual offshore rigs and platforms send their observations via email ( some via our Aberdeen weather centre, but increasingly via our message switching system in Exeter). Minos AWS systems ( only 1 at present but further systems on order) send their observations via Argos.
The moored buoys use Meteosat for their data tranmissions although plans are being developed to migrate some of these funtions to Iridium. Argos is used for back up position data for the moored buoys
(Updated on May 2009)
- Five Batos AWS reporting compressed data through Inmarsat-C Data Report service (BATEUxx).
- Eight Baros AWS reporting compressed data through Iridium SBD (BAREUxx).
NOAA is using Inmarsat-C Data Mode for their conventional VOS. E-logbook SEAS makes binary messages which are sent through dedicated SAC and LES. In parallel, SEAS is able to make binary AMVER messages which are sent through the same way than observation messages. See: