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1. OPERATION
1-3
The FA-150 should be powered while underway or at anchor. The master may
switch off the AIS if he believes that the continual operation of the AIS might
compromise the safety or security of his ship. The AIS should be restarted
once the source of danger has disappeared.
The equipment transmits own ship static data within two minutes of start-up
and it is transmitted at six-minute intervals. Static data includes MMSI number,
IMO number, call sign, ship name, ship length and width, ship type and GPS
antenna position.
In addition to static data, ship’s dynamic data is also transmitted. This data
includes position with accuracy, SOG, COG, rate of turn, heading, etc. Dynamic
data is transmitted every 2 s to 3 min depending on ship’s speed, course
change. Voyage-related data, such as ship’s draft, hazardous cargo,
destination and estimated time of arrival are transmitted at six-minute intervals.
The FA-150 starts receiving data from AIS-equipped ships as soon as it is
turned on, and those ships’ location on the plotter display is shown with the AIS
symbol. (To learn more about the plotter display, see paragraph 1.7.) With
connection of a radar or ECDIS, the AIS target symbols may be overlaid on the
radar or ECDIS.
Note 1: If no navigation sensor is installed or a sensor such as a gyrocompass
has failed, the AIS automatically transmits “not available” data.
Note 2:
The reporting intervals are as follows:
Ship’s navigation status and reporting interval
Ship’s navigation status Reporting interval
(Class A target)
Ship at anchor or moored and not
moving faster than 3 kts
3 min
Ship at anchor or moored and moving at
more than 3 kts
10 s
0-14 kt speed 10 s
0-14 kt speed with course change
3 1/3 s
14-23 kt speed
6 s
14-23 kt speed with course change
2 s
Speed higher than 23 kt
2 s
Speed higher than 23 kt with course
change
2 s