FLIR Raymarine AIS5000, Installation & Operation Instructions, Page: 52 / 110

Operation
Page 50
Table 6 Status indicators
4.6.7 Onboard system self-test
4.6.7.1 Watchdog
A software and hardware 'watchdog' continually monitor the correct operation
of the unit. In the very unlikely event of internal real time software tasks failing
to execute, the software watchdog which monitors the completion of all
internal software tasks will restart the software. In the even more unlikely event
that the software watchdog itself fails to maintain the hardware watchdog, then
the hardware watchdog will restart the entire unit.
4.6.7.2 Built in Integrity Tests and alarms
The AIS transceiver performs self checking functions continuously. If a self
check fails a display will appear on the screen notifying the operator of this.
This will be accompanied by a sound. The alarm can be acknowledged via an
Icon Description
1W Shown when the transmitter is set to 1W
mode.
INT GNSS Shown when the internal GNSS receiver has
a valid position fix.
EXT GNSS Shown when the connected external GNSS
receiver has a valid position fix.
NO GNSS Shown when there is no valid internal or
external position fix.
INT DGNSS Shown when the internal GNSS receiver has
a valid differential position fix.
EXT DGNSS Shown when the connected external GNSS
receiver has a valid differential position fix.