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):

DAC or VPFI:

FI / Message ID:

State:

deprecated

State link:

Tidal window [1]

Number of slots (max):

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