2 s Ship 23 knots  2 s Ship 23 knots and changing course  (1) When a mobile station determines that it is the semaphore (see § 3.1.1.4, Annex 2), the reporting interval should decrease to 2 s (see § 3.1.3.3.2, Annex 2). NOTE 1 These values have been chosen to minimize unnecessary loading of the radio channels while – maintaining compliance within the IMO AIS performance standards. NOTE 2 If the autonomous mode requires a shorter reporting interval than the assigned mode, the Class A – shipborne mobile AIS station should use the autonomous mode. TABLE 2 Reporting intervals for equipment other than Class A shipborne mobile equipment Nominal Increased Platform’s condition reporting interval reporting interval Class B shipborne mobile equipment not moving 3 min 3 min “SO” faster than 2 knots Class B shipborne mobile equipment moving 30 s 30 s “SO” 2−14 knots Class B shipborne mobile equipment moving 15 s 30 s(3) “SO” 14−23 knots Class B shipborne mobile equipment moving 5 s 15 s(3) “SO” >23 knots Class B shipborne mobile equipment not moving 3 min “CS” – faster than 2 knots B shipborne mobile equipment moving faster 30 s “CS” – than 2 knots Search and rescue aircraft (airborne mobile equipment) 10 s(2) – Aids to navigation 3 min – AIS base station 10 s(1) – base station’s reporting interval (RI) should decrease to 3 1/3 s after the station detects that one or more stations are synchronizing to the base station (see § 3.1.3.3.1, Annex 2). (2) Shorter RI down to 2 s could be used in the area of search and rescue operations. (3) Class B AIS shall report at the reporting interval” only when the last four consecutive “SO” “Increased frames each have less than 50% Free slots. Class B AIS shall not return to the reporting “SO” “Normal interval” until 65% or more of the slots of each of the last four consecutive frames are free. 5 Frequency band AIS stations should be designed for operation in the VHF maritime mobile band, with 25 kHz bandwidth, in accordance with RR Appendix 18 and Recommendation ITUR M.1084, Annex 4. The minimum requirement for certain of equipment may be a subset of the VHF maritime band.
Ship  23 knots 2 s Ship  23 knots and changing course 2 s (1) When a mobile station determines that it is the semaphore (see § 3.1.1.4, Annex 2), the reporting interval should decrease to 2 s (see § 3.1.3.3.2, Annex 2). NOTE 1 – These values have been chosen to minimize unnecessary loading of the radio channels while maintaining compliance within the IMO AIS performance standards. NOTE 2 – If the autonomous mode requires a shorter reporting interval than the assigned mode, the Class A shipborne mobile AIS station should use the autonomous mode. TABLE 2 Reporting intervals for equipment other than Class A shipborne mobile equipment Platform’s condition Nominal reporting interval Increased reporting interval Class B “SO” shipborne mobile equipment not moving faster than 2 knots 3 min 3 min Class B “SO” shipborne mobile equipment moving 2−14 knots 30 s 30 s Class B “SO” shipborne mobile equipment moving 14−23 knots 15 s 30 s(3) Class B “SO” shipborne mobile equipment moving >23 knots 5 s 15 s(3) Class B “CS” shipborne mobile equipment not moving faster than 2 knots 3 min – B “CS” shipborne mobile equipment moving faster than 2 knots 30 s – Search and rescue aircraft (airborne mobile equipment) 10 s(2) – Aids to navigation 3 min – AIS base station 10 s(1) – base station’s reporting interval (RI) should decrease to 3 1/3 s after the station detects that one or more stations are synchronizing to the base station (see § 3.1.3.3.1, Annex 2). (2) Shorter RI down to 2 s could be used in the area of search and rescue operations. (3) Class B “SO” AIS shall report at the “Increased reporting interval” only when the last four consecutive frames each have less than 50% Free slots. Class B “SO” AIS shall not return to the “Normal reporting interval” until 65% or more of the slots of each of the last four consecutive frames are free. 5 Frequency band AIS stations should be designed for operation in the VHF maritime mobile band, with 25 kHz bandwidth, in accordance with RR Appendix 18 and Recommendation ITUR M.1084, Annex 4. The minimum requirement for certain of equipment may be a subset of the VHF maritime band.
R-REC-M.1371-5-201402-I!!MSW-E.docx