IMO meteorological and hydroglogical data. Specified in SN/Circ.236 Annex 2. Also defined in IALA Guidelines on AIS, Vol 1, Part 1, Ed. 1.3. Guildeline No 1028.
Note:All unavailable values are defined to be the highest possible number in the next following
| Name | NumberOfBits | ArrayLength | Type | Units | Description |
|---|---|---|---|---|---|
| MessageID | 6 | uint | AIS message number. Must be 8 | ||
| RepeatIndicator | 2 | uint | Indicated how many times a message has been repeated 0: default 3: do not repeat any more |
||
| UserID | 30 | uint | MMSI number of transmitter broadcasting the message | ||
| Spare | 2 | uint | Reserved for definition by a regional authority. | ||
| dac | 10 | uint | Designated Area Code - part 1 of the IAI | ||
| fid | 6 | uint | Functional Identifier - part 2 of the IAI | ||
| latitude | 24 | decimal | degrees | Location of the vessel. North South location | |
| longitude | 25 | decimal | degrees | Location of the vessel. East West location | |
| day | 5 | uint | days | Day 0..31 | |
| hour | 5 | uint | hours | Hour 0..23 | |
| min | 6 | uint | minutes | Min | |
| avewind | 7 | uint | knots | Average wind speed values for the last 10 minutes. | |
| windgust | 7 | uint | knots | Wind gust is the max wind speed value reading during the last 10 minutes. | |
| winddir | 9 | uint | degrees | Wind direction | |
| windgustdir | 9 | uint | degrees | Wind direction for the gust. | |
| airtemp | 11 | decimal | degrees Celsius | Dry bulb temperature | |
| relhumid | 7 | uint | percent | Relative humidity | |
| dewpoint | 10 | decimal | degrees Celsius | Dew Point | |
| airpressure | 9 | udecimal | hPa | Air pressure | |
| airpressuretrend | 2 | uint | Air pressure trend 0: steady 1: decreasing 2: increasing 3: unavailable |
||
| horizvis | 8 | udecimal | nm | Horizontal visibility | |
| waterlevel | 9 | decimal | m | Water level (incl. tide) | |
| waterleveltrend | 2 | uint | Water level trend 0: steady 1: decreasing 2: increasing 3: unavailable |
||
| surfcurspeed | 8 | udecimal | knots | Surface current speed | |
| surfcurdir | 9 | uint | degrees | Surface current direction | |
| curspeed2 | 8 | udecimal | knots | Level 2 current speed | |
| curdir2 | 9 | uint | degrees | Level 2 current direction | |
| curlevel2 | 5 | uint | m | Measuring level below sea surface for level 2 | |
| curspeed3 | 8 | udecimal | knots | Level 3 current speed | |
| curdir3 | 9 | uint | degrees | Level 3 current direction | |
| curlevel3 | 5 | uint | m | Measuring level below sea surface for level 3 | |
| sigwaveheight | 8 | udecimal | m | Significant wave height | |
| waveperiod | 6 | uint | sec | Wave period | |
| wavedir | 9 | uint | degrees | Wave direction | |
| swellheight | 8 | udecimal | m | Swell height | |
| swellperiod | 6 | uint | sec | Swell period | |
| swelldir | 9 | uint | degrees | Swell direction | |
| seastate | 4 | uint | Beaufort scale | Sea state according to the Beaufort scale 0: Calm 1: Light air 2: Light breeze 3: Gentle breeze 4: Moderate breeze 5: Fresh breeze 6: Strong breeze 7: Near gale 8: Gale 9: Strong gale 10: Storm 11: Violent storm 12: Hurricane 15: unavailable |
|
| watertemp | 10 | udecimal | degrees Celsius | Water temperature | |
| preciptype | 3 | uint | WMO scale index | According to WMO 0: FIX: find the WMO list of types 7: unavailable |
|
| salinity | 9 | decimal | 0/00 | Salinity | |
| ice | 2 | uint | Yes or no for the presence of ice 0: Not sure. Maybe no ice? 1: Not sure. Maybe yes ice? 2: Not sure. Maybe not allowed? 3: Unknown? |
||
| Spare | 6 | uint | Must be zero |