Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Alerts Radar/Chart Radar User Guide
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Alert Status
There are three types of alert status:

Unacknowledged Alerts
When an alert is detected, that alert appears with a flashing
background colour in the Alert Status Indicator and the Alert
display. If more than one alert condition exists, the alert with the
highest priority is shown. The alert continues to be shown in the
indicator until it is either:

acknowledged;

automatically cleared; or

replaced with either an alert of higher priority, or a more
recent alert of the same priority.
If the internal buzzer is enabled, the buzzer will only sound when
there are unacknowledged alarms or warnings.

Acknowledged Alerts
If an alert has been acknowledged, but the fault has not been
corrected, the message
Alarms Present or Warnings Present is
displayed in non-flashing red or yellow in the Alert Status Indicator.
The acknowledged alert remains listed with the text displayed in
coloured lettering in the Alerts Display area, unless the
Hide
Acknowledged box has been ticked.

No Alerts
If there are no alerts the caption No Alerts is displayed in the Alert
Status Indicator and the system background colour is shown.