AIS Message Definitions

AIS Message: waterlevel (366:63:)

Description:

Water level report. This is DRAFT/PROPOSED message format and should not be considered any sort of standard. The main goal is to illustrated the Tide Aware ENC and the AIS XML engine.

Note:This is based on discussions with the NOAA PORTS group. 2nd generation water level message prototype

See Also:http://opendap.co-ops.nos.noaa.gov/axis/

See Also:http://vislab-ccom.unh.edu/~schwehr/software/noaadata/ais-messages/waterlevel.html

See Also:http://http://vislab-ccom.unh.edu/~schwehr/ais/waterlevel/

See Also:http://co-ops.nos.noaa.gov/corms.html

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 Unique ship identification number (MMSI)
Spare 2 uint Reserved for definition by a regional authority.
dac 10 uint Designated Area Code
fid 6 uint Functional Identifier
month 4 uint Time the measurement represents month 1..12
day 5 uint Time the measurement represents day of the month 1..31
hour 5 uint Time the measurement represents UTC hours 0..23
min 6 uint Time the measurement represents minutes
stationid 6 7 aisstr6 Character identifier of the station. Usually a number.
waterlevel 16 int cm Water level in centimeters
datum 5 uint What reference datum applies to the value
0: MLLW
1: IGLD-85
2: WaterDepth
3: STND
4: MHW
5: MSL
6: NGVD
7: NAVD
8: WGS-84
9: LAT
10: Pool
11: Gauge
31: Unknown/Unavailable
sigma 7 uint cm Standard deviation of 1 second samples used to compute the water level height. FIX: is this the correct description of sigma?
source 3 uint How the water level was derived
0: No data
1: Realtime sensor data
2: Raw realtime sensor data - no validation
3: Predicted water level - tidal data generated by using harmonic analysis
4: Forecast water level - tidal data generated by use of a hydrodynamic model
5: Reserved
6: Reserved
7: Reserved