For future equipment: this message is not needed and should not be used. All content is covered by Message 18, Message 24A and 24B.
For legacy equipment: this message should be used by Class B shipborne mobile equipment. This message should be transmitted once every 6 min in two slots allocated by the use of Message 18 in the ITDMA communication state. This message should be transmitted immediately after the following parameter values change: dimension of ship/reference for position or type of electronic position fixing device.
TABLE 71[1]

Parameter	Number of bits	Description
Message ID	6	Identifier for Message 19; always 19
Repeat indicator	2	Used by the repeater to indicate how many times a message has been repeated. See § 4.6.1, Annex 2; 0-3; 0 = default; 3 = do not repeat any more
User ID	30	MMSI number
Spare	8	Not used. Should be set to zero. Reserved for future use
SOG Provided by Message 18	10	Speed over ground in 1/10 knot steps (0-102.2 knots) 1 023 = not available, 1 022 = 102.2 knots or higher
Position accuracy Provided by Message 18	1	1 = high (£10 m) 0 = low (>10 m) 0 = default The PA flag should be determined in accordance with Table 50
Longitude Provided by Message 18	28	Longitude in 1/10 000 min (±180°, East = positive (as per 2’s complement), West = negative (as per 2’s complement); 181° (6791AC0h) = not available = default)
Latitude Provided by Message 18	27	Latitude in 1/10 000 min (±90°, North = positive (as per 2’s complement), South = negative (as per 2’s complement); 91 = (3412140h) = not available = default)
COG Provided by Message 18	12	Course over ground in 1/10 = (0-3 599). 3 600 (E10h) = not available = default; 3 601-4 095 should not be used
True heading Provided by Message 18	9	Degrees (0-359) (511 indicates not available = default)
Time stamp Provided by Message 18	6	UTC second when the report was generated by the EPFS (0-59 or 60) if time stamp is not available, which should also be the default value or 61 if positioning system is in manual input mode or 62 if electronic position fixing system operates in estimated (dead reckoning) mode, or 63 if the positioning system is inoperative)
Spare	4	Not used. Should be set to zero. Reserved for future use
Name Provided by Message 24A	120	Maximum 20 characters 6-bit ASCII, as defined in Table 47. @@@@@@@@@@@@@@@@@@@@ = not available = default
Type of ship and cargo type Provided by Message 24B	8	0 = not available or no ship = default 1-99 = as defined in § 3.3.2 100-199 = reserved, for regional use 200-255 = reserved, for future use
Dimension of ship/reference for position Provided by Message 24B	30	Dimensions of ship in metres and reference point for reported position (see Fig. 41 and § 3.3.3)
Type of electronic position fixing device Provided by Message 24B	4	0 = Undefined (default); 1 = GPS, 2 = GLONASS, 3 = combined GPS/GLONASS, 4 = Loran-C, 5 = Chayka, 6 = integrated navigation system, 7 = surveyed; 8 = Galileo, 9-14 = not used, 15 = internal GNSS
RAIM-flag Provided by Message 18	1	RAIM (Receiver autonomous integrity monitoring) flag of electronic position fixing device; 0 = RAIM not in use = default; 1 = RAIM in use see Table 50
DTE Provided by Message 18 (Display Flag)	1	Data terminal ready (0 = available 1 = not available; = default) (see § 3.3.1)
Assigned mode flag Provided by Message 18 (Mode Flag)	1	0 = Station operating in autonomous and continuous mode = default 1 = Station operating in assigned mode
Spare	4	Not used. Should be set to zero. Reserved for future use
Number of bits	312	Occupies two slots