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RTA at lock/bridge/terminal

Introduction/Additional information: 

Introduction:

The RTA message shall be sent as answer to a previously received ETA message (Inland ASM FI 21) from shore to the vessel to confirm the requested time of arrival, or to propose a different schedule.

Additional Information:

  • As an answer to an ETA message, the RTA shall be sent within 15, maximum 30 minutes after the reception of the initial ETA message.
  • An RTA message might also be solely initiated by a shore application, e.g. a lock, to inform the addressed ship of the requested time of arrival. An optional ETA message may be sent from vessel to shore to confirm the proposed RTA. If the vessel agrees with the RTA, the time of arrival in the ETA answer shall match with the RTA. In this case no further confirmation RTA shall be expected.
  • UN country code, UN location code, Fairway section number, Terminal code and Fairway hectometre shall be derived from the ISRS code as part of the RIS Index published in the European Reference Data Management System (ERDMS).
  • The RTA shall always be transmitted in UTC but for input and display converted in local time of the destination.
Permitted as from: 
10/10/2007
Registrant: 
EU
Physical link: 
AIS
Message number (0=VDES-VDE): 
6
DAC or VPFI: 
200
FI / Message ID: 
22
Technical point of contact: 

RIS VTT

State: 
in force
Number of slots (max): 
2
Last modified: 
29/01/2021 - 23:18
Reporting Rate: 

As an answer to an ETA message, the RTA shall be sent within 15, maximum 30 minutes after the reception of the initial ETA message.

Details: 
PARAMETERBitDescription
Message ID6Identifier for Message 6; always 6
Repeat Indicator2Used by the repeater to indicate how many times a message has been repeated. Default = 0 ; 3 = do not repeat any more
Source ID30MMSI number of source station
Sequence Number20 - 3
Destination ID30MMSI number of destination station
Retransmit Flag1Retransmit Flag should be set upon retransmission: 0 = no retransmission = default; 1 = retransmitted.
Spare1Not used, should be set to zero. Reserved for future use.
Application Identifier16As described in Table 2,6
UN country code122*6 Bit characters
UN location code183*6 Bit characters
Fairway section number305*6 Bit characters
Terminal code305*6 Bit characters
Fairway hectometre305*6 Bit characters
RTA at lock/bridge/terminal20Recommended Time of Arrival
MMDDHHMM UTC Bits 19 - 16: month 1 - 12; 0 = not available = default
Bits 15 - 11: day 1 - 31 0 = not available = default
Bits 10 - 6: hour 0 - 23 24 = not available = default
Bits 5 - 0: minute 0 - 59 60 = not available = default
Lock/bridge/terminal status20 = operational
1 = limited operation (e.g. obstructed by technical conditions, only one lock chamber available, etc.)
2 = out of order
3 = not available
Spare2Not used, should be set to zero. Reserved for future use.
Total232occupies 2 slots