Navico SIMRAD AI50, Manual For Use

Page: 72 / 84

72 Alarms
Lost vessel alarm (1)
This is a Level 1 alarm and will sound whether the Lost
Vessel alarm, as described in Section 6.5, has been set by
the user or not.
If a vessel activates a CPA/TCPA or Guard Zone alarm,
and the AIS transmissions from that vessel are lost;
regardless of what screen the AI50 is in, an audible alarm
will sound and a “Lost Vessel Collision Alert” window will
open, displaying the last received information.
To confirm and clear this alarm, press
W
, this will close
the window and return you to current display.
The icon of the vessel which caused the alarm to activate
will change to a “Lost Vessel” icon. Refer to section 7.2.
It will retain its previous color and bold outlines, and
flash at a rate of once every second, indicating that this
condition still exists.
The icon will remain on the display in this state for 10
minutes before being erased. However, if reception from
the lost vessel’s AIS is re-established, the icon will return
to its previous state.
Guard zone alarm
This is a Level 2 alarm. The guard zone is determined
by the radius dimension entered during setup. Refer to
Section 6.5. A red circle will surround your vessel, but the
size will depend on the range selected.
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 alarm will be generated, regardless of what screen the
AI50 is in, and a “Guard Zone Collision Warning” window
will be displayed.
) )