Operation 17
4 Operation
4.1 General
The NAIS-300 has a limited user interface, consisting of
a transmit enable/disable switch, (not supplied), and four
indicators on the top of the unit, they are:
PWR [Green] - Power/GPS Lock Status/Silent Mode
BIIT [Red] - Built In Integrity Test
TX [Yellow] - Transmit
RX [Blue] -AIS Message Received
4.2 Indicators
At power up, all four LED’s will light continuously for five
seconds to show that they are working, then they will go
into the following routines:
PWR
After the initial five seconds the LED will do two short
flashes and a longer pause before repeating itself. This
will continue until a GPS position fix is acquired. Once a
fix has been obtained, the LED will stay on continuously.
If, after a GPS fix, the transmitter has been disabled,
(Silent Mode), the LED will flash at a rate of one second
on and one second off.
BIIT (Built In Integrity Test)
The NAIS-300 is constantly monitoring and testing the
integrity of the AIS transceiver.
After the initial five seconds the LED will go out. Should a
fault be detected within the unit, the “BIIT” LED will start
to flash. The flash sequences listed below indicate the
specific faults:
1 flash - transponder not reponding
2 flashes - transmitter fault
3 flashes - receiver fault
4 flashes - VHF antenna VSWR fault
5 flashes - no GPS sensor
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