IMO fairway closed. Specified in SN/Circ.236 Annex 2, page 4, Application 3. Also defined in IALA Guidelines on AIS, Vol 1, Part 1, Ed. 1.3. Guildeline No 1028. This message should be used to inform ships, in particular to give guidance to large vessels about temporary closed fairways or sections in ports. Attributes: broadcast, shore station transmitting, no acknowledgement. 472 AIS message number. Must be 8 8 Indicated how many times a message has been repeated 0 default do not repeat any more 1 MMSI number of transmitter broadcasting the message Not sure if this matches what IMO stated. 1193046 Reserved for definition by a regional authority. 0 Designated Area Code - part 1 of the IAI 1 Functional Identifier - part 2 of the IAI 11 Reason for closing What are the range of reasons? Are they predefined or free form? @@@@@@@@@@@@@@@@@@@@ FIX GIVE SAMPLE Location of closing from Need an explanation of this @@@@@@@@@@@@@@@@@@@@ FIX GIVE SAMPLE Location of closing To @@@@@@@@@@@@@@@@@@@@ FIX GIVE SAMPLE Extention of closed area WARNING: the units of this value are determined by the unit field See unit field 1001 321 Unit of extension value for range field m km nm cbl 0 Closing from day 31 Closing from month 12 From LT hour (appr) FIX: what is LT? 20 From LT minute (appr) 23 To day 27 To month 2 To LT hour (appr) 22 To LT minute (appr) 35 Padding out the slot 0