Controls For Ais - Furuno FAR-2228-NXT Operator's Manual

4. AIS OPERATION
An AIS transponder "sees" all ships fitted with an AIS transponder belonging to either
a Class A or Class B AIS. Additionally, the AIS transponder receives messages from
ships and non-ships (AIS SAR aircraft, AIS aid to navigation, AIS base station, and
AIS search and rescue transmitter).
There can be several hundreds or several thousands of AIS objects, and of those only
a few will be significant for your ship. To remove unnecessary AIS targets (class A or
class B AIS target and AIS SAR vessel) from the radar display, the feature “active and
sleeping AIS targets” is available. The feature "active and sleeping AIS targets" is very
effective for focusing on only those AIS targets that need supervision. Initially any new
AIS target received by an AIS transponder is not active (= “sleeping”). Such sleeping
targets are shown with a small triangle. The operator can pick any AIS target and
change it from sleeping to active. Active AIS targets are shown with a large triangle
with speed vector, headline, ROT indicator, etc. Further, the operator can pick active
AIS targets and change their status to sleeping.
An indication of AIS targets (class A or class B AIS target and AIS SAR vessel) acti-
vated capacity limit is given well before it is reached. When 95% of 50 targets are ac-
tivated, the Alert "ACTIVE AIS 95%" appears. When 50 targets are activated, the Alert
"ACTIVE AIS FULL" appears. Sleep any unnecessary AIS targets to allow acquisition
of new targets.
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Controls for AIS

The control unit has three keys that are used in the AIS mode. The keys are indicated
in the figure below.
• TARGET DATA: Shows the selected object’s data in the information box. If the tar-
get is sleeping, activates the target.
• TARGET CANCEL: Sleeps the cursor-selected target.
These functions, along with other AIS functions, can also be accessed from the [CUR-
SOR] menu (See section 1.7).
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