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.

Permitted as from:

01/06/2010

Registrant:

IMO Circ. 289

Physical link:

AIS

Message number (0=VDES-VDE):

DAC or VPFI:

FI / Message ID:

State:

in force

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; refer to ITU-R M.1371-3, Annex 2, § 5.3.1
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. Set to zero.
IAI	16	DAC = 001; FI =32
Time Stamp UTC Day		UTC date of the data.
UTC Month	4	1 - 12 0 = not available = default
UTC Day	5	1 - 31 0 = not available = default
Position #1 Longitude	25	Longitude in 1/1,000 min, ±180 degrees as per 2's complement (East = positive, West = negative). 181 = not available = default
Position #1 Latitude	24	Latitude in 1/1,000 min, ±90 degrees, as per 2's complement (North = positive, South = negative). 91 degrees = not available = default
From UTC Hour	5	0 - 23 24 = not available = default
From UTC Minute	6	0 - 59 60 = not available = default
To UTC Hour	5	0 - 23 24 = not available = default
To UTC Minute	6	0 - 59 60 = not available = default
Current Direction predicted #1	9	Direction of Current 1, in 1 degree steps. 0 - 359 degrees 360 = not available = default 361-511 (do not use)
Current Speed predicted #1	8	Speed of Current 1, in 0.1 knot steps. 0.0 – 25.0 knots 251 = speed 25.1 knots or greater 252 – 254 (reserved for future use) 255 = not available = default
Position #2 Longitude	25	Longitude in 1/1,000 min, ±180 degrees as per 2's complement (East = positive, West = negative). 181 = not available = default
Position #2 Latitude	24	Latitude in 1/1,000 min, ±90 degrees as per 2's complement (North = positive, South = negative). 91 degrees = not available = default
From UTC Hour	5	0 - 23 24 = not available = default
From UTC Minute	6	0 - 59 60 = not available = default
Notice from webmaster: In this prediction the To UTC Hour and to UTC Minute is missing.
Current Direction predicted #2	9	Direction of Current 2, in 1 degree steps. 0 - 359 degrees 360 = not available = default 361-511 (do not use)
Current Speed predicted #2	8	Speed of Current 2, in 0.1 knot steps. 0.0 – 25.0 knots 251 = speed 25.1 knots or greater. 252 - 254 (reserved for future use) 255 = not available = default
Position #2 Longitude Notice from the webmaster: #2 should be #3	25	Longitude in 1/1,000 min, ±180 degrees as per 2's complement (East = positive, West = negative). 181 = not available = default
Position #3 Latitude	24	Latitude in 1/1,000 min, ±90 degrees as per 2's complement (North = positive, South = negative). 91 degrees = not available = default
From UTC Hour	5	0 - 23 24 = not available = default
From UTC Minute	6	0 - 59 60 = not available = default
To UTC Hour	5	0 - 23 24 = not available = default
To UTC Minute	6	0 - 59 60 = not available = default
Current Direction predicted #3	9	Direction of Current 3, in 1 degree steps. 0 - 359 degrees 360 = not available = default 361 - 511 (not used)
Current Speed predicted #3	8	Speed of Current 3, in 0.1 knot steps. 0.0 - 25.0 knots 251 = speed 25.1 knots or greater 252 - 254 (reserved for future use) 255 = not available = default
Total	350	occupies 3 slots