5-40
5.3 AIS Operation
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5
5.3.8 Conditions for Deciding AIS Target to be Lost
About a lost target
When the data of an AIS target cannot be received for a specified time, the target is decided to be lost and
the target data is deleted. As shown in the table below, the time until target data is deleted varies
depending on the class of receive data and the target status.
Deciding AIS Target to be Lost
Time until data deletion
Target status
SOLAS ship
(Class A)
SOLAS ship
(Class B)
Vessel below 3 knots (Class A) or 2 knots (Class B) and it is
now at anchor or on the berth
18 min
18 min
Vessel of 3 knots or more and it is now at anchor or on the berth
60 sec
18 min
Vessel of 0 to 14 knots (Class B: 0 to 14 knots)
60 sec
180 sec
Vessel of 14 to 23 knots
36 sec
180 sec
Vessel of 23 knots or more
30 sec
180 sec
SAR (Search and Rescue)
60 sec
60 sec
ATON (Aid to Navigation)
18 min
18 min
Base Station
60 sec
60 sec
Reference:
When a dangerous target ship is lost, a lost alarm is issued and the symbol changes to a lost
symbol. The lost symbol will display continuously on the last-received position.
If the
[ALARM ACK]
key is pressed, the symbol is cleared.
Summary of Contents for JMA-5912-6
Page 2: ......
Page 17: ...xi NKE 2103 6 Scanner Unit NKE 2254 7 9 Scanner Unit Warning Label Warning Label...
Page 18: ...xii NKE 1130 Scanner Unit NQE 3151A Junction Box Warning Label Warning Label...
Page 19: ...xiii NQE 3141 4A 8A Interswitch Unit NBA 5111 Power Supply Warning Label Warning Label...
Page 20: ...xiv NQE 3167 Power Control Unit Warning Label...
Page 22: ...xvi Scanner Unit Type NKE 2254 9 9 feet NDC 1477 Radar Process Unit Desktop Type...
Page 23: ...xvii NWZ 170 Monitor Unit Desktop Type NCE 5171 Operation Unit Desktop Type...
Page 40: ......
Page 48: ...1 7 Fig 1 1 Outside Drawing of NKE 2103 6 SCANNER UNIT...
Page 49: ...1 8 1 4 Exterior Drawings y 1 Fig 1 2 Outside Drawing of NKE 2254 7 SCANNER UNIT...
Page 50: ...1 9 Fig 1 3 Outside Drawing of NKE 2254 9 SCANNER UNIT...
Page 51: ...1 10 1 4 Exterior Drawings y 1 Fig 1 4 Outside Drawing of NKE 1130 SCANNER UNIT...
Page 52: ...1 11 Fig 1 5 Outside Drawing of NWZ 170 MONITOR UNIT Option...
Page 54: ...1 13 Fig 1 7 Outside Drawing of NDC 1477 RADAR PROCESS UNIT...
Page 55: ...1 14 1 4 Exterior Drawings y 1 Fig 1 8 Outside Drawing of NCE 5171 OPERATION UNIT...
Page 56: ...1 15 Fig 1 9 Outside Drawing of NQE 3151A JUNCTION BOX...
Page 57: ...1 16 1 4 Exterior Drawings y 1 Fig 1 10 Outside Drawing of NQE 3141 4A INTERSWITCH UNIT Option...
Page 58: ...1 17 Fig 1 11 Outside Drawing of NQE 3141 8A INTERSWITCH UNIT Option...
Page 60: ...1 19 Fig 1 13 Outside Drawing of NQE 3167 POWER CONTROL UNIT Option...
Page 68: ...2 3 Lower left of the display Upper right of the display...
Page 242: ......
Page 328: ...7 9...
Page 384: ......
Page 402: ......
Page 421: ...APPENDIX...
Page 422: ......
Page 438: ...32bit bus BP BZ VD TI MTR PWRCNT P12V 12V RGB Fig 2 Block Diagram of JMA 5932 12 RADAR...
Page 442: ...Fig 6 Terminal Board Connection Diagram of RADAR and INTERSWITCH Unit Option...
Page 443: ...Fig 7 Power System Diagram of JMA 5912 6 JMA 5922 7 9 RADAR...
Page 445: ...Fig 9 Internal Connection Diagram of NDC 1477 RADAR PROCESS UNIT...
Page 446: ...Fig 10 Internal Connection Diagram of NQA 2123 INTERFACE UNIT...
Page 447: ...Fig 11 Internal Connection Diagram of NCE 5171 OPERATION UNIT...
Page 465: ......