Pseudo-AIS targets

Introduction/Additional information:

This message should be used to transmit VTS targets. This message should be variable in length, based on the amount of VTS targets. The maximum of VTS Targets transmitted in one International FM 16 should be seven (7). Because of the resulting effects of VDL channel loading, the transmission of International FM 16 should be no more than necessary to provide the necessary level of safety.
Attributes: broadcast, VTS transmitting, no acknowledgement.

Permitted as from:

19/05/2004

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:

VTS-generated/Synthetic targets [1]

Number of slots (max):

Last modified:

29/01/2021 - 23:18

Details:

Parameter	No. of bits	Description
Message ID	6	Identifier for Message 8 ; always 8
Repeat Indicator	2	Used by the repeater to indicate how many times a
		message has been repeated.
Source ID	30	Name of source station
Spare	2	Not used. Should be set to zero.
IAI	16	DAC =001 FI=17
VTS Target 1	120	Refer to table below; occupies 2 slots
VTS Target 1	120	Optional; refer to table below; occupies 2 slots
VTS Target 1	120	Optional; refer to table below; occupies 3 slots
VTS Target 1	120	Optional; refer to table below; occupies 3 slots
Total Number of bits	Max 536	3 slots

Parameter	Bits	Description
Type of target identifier	2	Identifier type 0 =The target identifier should be the MMSI number 1 =The target identifier should be the IMO number 2 =The target identifier should be the call sign 3 =Other (default)
Target ID	42	Target identifier. The target ID should depend on type of target identifier above. When call sign is used, it should be inserted using 6-bit ASCII. If target identifier is unknown, this field should be set to zero. When MMSI or IMO number is used, the least significant bit should equal bit zero of the target ID
Spare	4	Spare. Should be set to zero
Latitude	24	Latitude in 1/1 000 min
Longitude	25	Longitude in 1/1 000 min
COG	9	Course over ground (degrees) (0-359) 360 =not available =default
Time stamp	6	UTC second when the report was generated (0-59, or 60 if time stamp is not available, which should also be the default value)
SOG	8	Speed over ground in knots 0-254 255 =not available =default
Total	120