AIS Class B Transceiver
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being erased. However, if reception from the lost vessel’s AIS is re-
established, the icon will return to its previous state.
7.4 Collision Alarm – Guard Zone
This is a Level 2 alarm. The guard zone is determined by the radius
dimension entered by the user, as described in Section 5.5.1.2, and a red
circle will surround your vessel. The size of this circle will be dependent
on the display range selected.
Note If “Track Own Vessel” mode has been activated; the red circle will track
with your own vessel’s icon.
For every AIS equipped vessel entering your Guard Zone, an audible
alarm will sound, regardless of what screen the AI50 is in and a “Guard
Zone Collision Warning” window will be displayed. Fig. 7.3
To confirm and clear this alarm press the MENU key. The icon of
the vessel which caused the alarm to activate will turn red, indicating an
alarm condition still exists.
Once a vessel leaves the Guard Zone its icon will return to the normal state.
7.5 BIIT Alarm
The BIIT (Built In Integrity Test) is a Level 2 alarm.
The AI50 is constantly monitoring and testing the integrity of the AIS
transceiver. Should a fault be detected within the unit, the small circle
situated in the bottom right hand corner of the display flashes red, and a
text message informs the user about the transceiver status.
The “BIIT” message will remain there until the fault is cleared by the
Fig. 7.3 – Guard Zone Warning
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