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Tidal window

Introduction/Additional information: 

This message should be used to inform vessels about tidal windows which allow a vessel the safe passage of a fairway. The message includes predictions of current speed and current direction. In this example, three points of tidal information are given. Attributes of message: addressed, shore station transmitting, acknowledgement required.

Permitted as from: 
01/05/2004
Not to be used after: 
01/01/2013
Registrant: 
IMO Circ. 236
Physical link: 
AIS
Message number (0=VDES-VDE): 
6
DAC or VPFI: 
1
FI / Message ID: 
14
State: 
deprecated
State link: 
Tidal window
Number of slots (max): 
3
Last modified: 
29/01/2021 - 23:18
Details: 
 Parameter    No. of bits    Description  
 Message ID   6  Identifier for Message 6;  always 6 
 Repeat Indicator   2  Used by the repeater to indicate how many times a message has been repeated.
0-3; 
0 = default; 
3 = do not repeat anymore 
 Source ID   30  MMSI number of source station  
 Sequence Number   2  0-3.  
 Destination ID   30  MMSI number of destination station  
 Retransmit Flag   1  Retransmit Flag should be set upon retransmission:
0 = no retransmission = default; 
1 = retransmitted.  
 Spare   1  Not used. Should be zero.  
 IAI   16 DAC = 001; 
FI = 14 
 UTC month   4  1-12; 
0 = UTC month not available = default; 
13-15 not used  
 UTC day   5  1-31;
0 = UTC day not available = default
 Position #1 Lat   27  1/10 000 min (±90 degrees,
North = positive,
South = negative; 
91 degrees = not available = default).  
 Position #1 Lon   28  1/10 000 min (±180 degrees, East = positive, West = negative; 181 degrees = not available = default).  
 From UTC hour   5  0-23; 
24 = UTC hour not available = default; 
25-31not used  
 From UTC minute   6  0-59; 
60 = UTC minute not available = default; 
61-63 unused  
 To UTC hour   5  0-23; 
24 = UTC hour not available = default; 
25-31not used  
 To UTC minute   6  0-59; 
60 = UTC minute not available = default; 
61-63 unused  
 Current direction predicted #1   9  Current direction in degrees. ( valid range 0-359, 360 = not available = default).  
 Current speed predicted #1   7  Current speed in 0,1 knots. (valid range 0-126;  127 = not available = default). 
 Position #2 Lat   27  1/10 000 min (±90 degrees, North = positive, South = negative;  91 degrees = not available = default). 
 Position #2 Lon   28  1/10 000 min (±180 degrees, East = positive, West = negative;  181 degrees = not available = default).  
 From UTC hour   5  0-23; 
24 = UTC hour not available = default; 
25-31not used  
 From UTC minute   6  0-59; 
60 = UTC minute not available = default; 
61-63 unused  
 To UTC hour   5  0-23; 
24 = UTC hour not available = default; 
25-31not used  
 To UTC minute   6  0-59; 
60 = UTC minute not available = default; 
61-63 unused  
 Current direction predicted #2   9  Current direction in degrees. ( valid range 0-359, 360 = not available = default).  
 Current speed predicted #2   7  Current speed in 0,1 knots. (valid range 0-126;  127 = not available = default). 
 Position #3 Lat   27  1/10 000 min (±90 degrees, North = positive, South = negative;  91 degrees = not available = default). 
 Position #3 Lon   28  1/10 000 min (±180 degrees, East = positive, West = negative;  181 degrees = not available = default).  
 From UTC hour   5  0-23; 
24 = UTC hour not available = default; 
25-31not used  
 From UTC minute   6  0-59; 
60 = UTC minute not available = default; 
61-63 unused  
 To UTC hour   5  0-23; 
24 = UTC hour not available = default; 
25-31not used  
 To UTC minute   6  0-59; 
60 = UTC minute not available = default; 
61-63 unused  
 Current direction predicted #3   9  Current direction in degrees. ( valid range 0-359, 360 = not available = default).  
 Current speed predicted #3   7  Current speed in 0,1 knots. (valid range 0-126;  127 = not available = default). 
 Total number of bits   376  occupies 3 slots