Route Information (encrypted)

Introduction/Additional information:

This message provides encrypted information concerning a route.

Usage Notes

This Message 26 Route Information provides for both broadcast and addressed messages. Message addressing, when required, shall be performed using the Destination Indicator and Destination ID fields inherent to the Message 26 structure.
The route may contain up to 14 waypoints, to keep maximum message size parity with other STEDS messages.
The PI shall expect an ACK for the addressed form of the message, and shall retransmit according to the Usage Notes of FID 9 if it does not receive one.

Version 0:

This is an encrypted version of Route information IMO Circ. 289 DAC:001 FI: 27 and 28 listed in IALA ASM collection.

This ASM only has a Message 26 variant.

Permitted as from:

12/05/2016

Registrant:

USCG

Physical link:

AIS

Message number (0=VDES-VDE):

DAC or VPFI:

366

FI / Message ID:

Version:

State:

in force

State link:

Route information [1]

Route information [2]

Number of slots (max):

Last modified:

29/01/2021 - 23:19

Used by:

USCG

Details:

Encrypted Route Information Message (Message 26, Addressed)

	Parameter	# of Bits	Description
	Parameter	# of Bits	Description
Standard Message Header	Message ID	6	Identifier for Message 26; always 26.
	Repeat Indicator	2	Indicates how many times a message has been repeated. 0 – 3; 0 = default; 3 = do not repeat any more. Set to zero (default).
	Source MMSI	30	MMSI number of source station. Varies according to the transmitter ID.
	Destination Indicator	1	0 = broadcast (no Destination ID field) 1 = Addressed (30 bit Destination ID field). Set to 1 (addressed).
	Binary Data Flag	1	0 = unstructured binary data (no Application Identifier bits used) 1 = binary data coded as defined by the 16-bit AI. Set to 1 (structured).
	Destination ID	30	MMSI number of destination station.
	Spare	2	Not used, Set to zero.

Binary Data	Designated Area Code			10	Designated area code (DAC). Set to 366.
	Function Identifier			6	Function identifier. Set to (decimal) 37.
	Encrypted Payload	Version		3	Sequential number used to indicate the message version in steps of 1. 0 = test message = default; 1 – 7 = message version. Set to zero.
		Message Linkage ID		10	A source-specific random number, unique across recent binary messages with Message Linkage ID. Used to connect the additional information in this Route Message with another ASM. The Message Linkage ID and the source MMSI uniquely identify the sent message. 1 – 1,023; 0 = not available.
		Sender Classification		3	0 = ship = default, 1 = authority, 2 - 7 (reserved for future use)
		Route Type		5	0 = not available = default 1 = mandatory route 2 = recommended route 3 = alternative route 4 = recommended route through ice 5 = ship route plan 6 - 30 (reserved for future use) 31 = cancellation (cancel route as identified by Message Linkage ID)
		Start date and time of route	UTC Month	4	Start UTC month of the Area notice. 1 -12 0 = not available = default, 13 -15 = reserved for future use
			UTC Day	5	Start UTC day of the Area notice. 1 -31 0 = not available = default
			UTC Hour	5	Start UTC hour of the Area notice. 0 – 23 24 = not available = default, 25- 31 = reserved for future use
			UTC Minute	6	Start UTC Minute of the Area notice 0 – 59 60 = not available = default, 61-63 reserved for future use
		Duration		18	Minutes until end of Validity Route. Measured from start date and time of Route Information. 0 = cancel route, 262,143 = undefined = default Maximum duration is 262,142 minutes (182.04 days).
		Number of waypoints		5	Number of waypoints. 1 – 14 0 = no waypoint = default, 15 - 31 (not used)
		Waypoints		Max 770	Variable number of waypoints 1 - 14 (55 bit each), reference Table 13.3, IALA ASM DAC=001, FI=28). The number of waypoints is determined by the length of the message.
		Encryption Bit Padding		Variable	Sufficient spare bits to ensure that the binary data is a multiple of 128 bits for block encryption (256, 384, 512, 640, 768, or 896). Set to 0.
	Checksum			16	16-bit CRC calculated as per EAIS Specification
Footer	Spare			4	Four extra bits to ensure the message ends on a byte boundary. Set to zero.
	Communications State Selector			1	0 = SOTDMA communication state follows 1 = ITDMA communication state follows
	Communications State			19	SOTDMA communication state (see ITU 1371-5 § 3.3.7.2.1, Annex 2), if communication state selector flag is set to 0, or ITDMA communication state (§ 3.3.7.3.2, Annex 2), if communication state selector flag is set to 1.
Total bits				256 – 1024	2 - 5 Slot Binary Message

1. 1. Message 26 Broadcast Format

Encrypted Route Information Message (Message 26, Broadcast)

	Parameter			# of Bits	Description

Standard Message Header	Message ID			6	Identifier for Message 26; always 26.
	Repeat Indicator			2	Indicates how many times a message has been repeated. 0 – 3; 0 = default; 3 = do not repeat any more. Set to zero (default).
	Source MMSI			30	MMSI number of source station. Varies according to the transmitter ID.
	Destination Indicator			1	0 = broadcast (no Destination ID field) 1 = Addressed (30 bit Destination ID field). Set to 0 (broadcast).
	Binary Data Flag			1	0 = unstructured binary data (no Application Identifier bits used) 1 = binary data coded as defined by the 16-bit AI. Set to 1 (structured).
	Destination ID			0	MMSI number of destination station. Not used.
	Spare			0	Not used.
Binary Data	Designated Area Code			10	Designated area code (DAC). Set to 366.
	Function Identifier			6	Function identifier. Set to 37.
	Encrypted Payload	Version		3	Sequential number used to indicate the message version in steps of 1. 0 = test message = default; 1 – 7 = message version. Set to zero.
		Message Linkage ID		10	A source-specific random number, unique across recent binary messages with Message Linkage ID. Used to connect the additional information in this Route Message with another ASM. The Message Linkage ID and the source MMSI uniquely identify the sent message. 1 – 1,023; 0 = not available.
		Sender Classification		3	0 = ship = default, 1 = authority, 2 - 7 (reserved for future use)
		Route Type		5	0 = not available = default 1 = mandatory route 2 = recommended route 3 = alternative route 4 = recommended route through ice 5 = ship route plan 6 - 30 (reserved for future use) 31 = cancellation (cancel route as identified by Message Linkage ID)
		Start date and time of Route	UTC Month	4	Start UTC month of the Area notice. 1 -12 0 = not available = default, 13 -15 = reserved for future use
			UTC Day	5	Start UTC day of the Area notice. 1 -31 0 = not available = default
			UTC Hour	5	Start UTC hour of the Area notice. 0 – 23 24 = not available = default, 25- 31 = reserved for future use
			UTC Minute	6	Start UTC Minute of the Area notice. 0 – 59 60 = not available = default, 61-63 reserved for future use

		Duration	18	Minutes until end end of route validity. Measured from start date and time of Route Information. 0 = cancel Area Notice, 262,143 = undefined = default Maximum duration is 262,142 minutes (182.04 days).
		Number of waypoints	5	Number of waypoints. 1 - 14 0 = no waypoint = default, 15 - 31 (not used)
		Waypoints	Max 770	Variable number of waypoints 1 - 14 (55 bit each), reference Table 13.3 of IALA ASM DAC=001, FI=28. The number of waypoints is determined by the length of the message.
		Encryption Bit Padding	Variable	Sufficient spare bits to ensure that the binary data is a multiple of 128 bits for block encryption (128, 256, 384, 512, 640, 768, or 896). Set to 0.
	Checksum		16	16-bit CRC calculated as per EAIS Specification
Footer	Spare		4	Four extra bits to ensure the message ends on a byte boundary. Set to zero.
	Communications State Selector		1	0 = SOTDMA communication state follows 1 = ITDMA communication state follows
	Communications State		19	SOTDMA communication state (see ITU 1371-5 § 3.3.7.2.1, Annex 2), if communication state selector flag is set to 0, or ITDMA communication state (§ 3.3.7.3.2, Annex 2), if communication state selector flag is set to 1.
Total bits			224 – 992	2 - 5 Slot Binary Message

Attachment:

eais_idd_v5_4_8may17.pdf [3]