Expedition Navigation Software 
1 of 1- Peter
- Contributor
Offline - Registered: 6/17/2019
- Posts: 7
AIS and TWS, WTD
HI,
looking into the AIS options (pan list) a user can select TWD and TWS. Looking into the AIS definition CLASS B I can not find a definition for sending wind data. It would be great to have such information from other boats to look into the current wind situation around the actual position. Looking into the manual for the "WX to GRIB" function AIS is mention as data source.
Thank you in advance to help me further.
- DuncanR
- Expert
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- From: Up and down East Coast Aus
- Registered: 9/16/2015
- Posts: 470
Re: AIS and TWS, WTD
Peter, I think you may be confused. AIS does not send variables like that from other boats. The only variables it can send by definition are those that can be inferred from changes to position i.e. calculated external to the boat.
- Nick
- Moderator
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- Registered: 9/16/2015
- Posts: 2,966
Re: AIS and TWS, WTD
AIS does have the ability to send Meteorological and hydrological data in message 8.
I don't know many ships etc support it though.
- Peter
- Contributor
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- Registered: 6/17/2019
- Posts: 7
Re: AIS and TWS, WTD
Thank you for your answers and hints. After screening 30k AIS records (in the area of Greece) I did not find any message type 8. Could you please explain from which type of data source TWS and TWD will be filled in the AIS pan list.
- •
Thread Starter- Nick
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- Registered: 9/16/2015
- Posts: 2,966
Re: AIS and TWS, WTD
Mostly AIS meteorological reports. I have seen them from fixed installations.