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3. USING THE TRANSPONDER
3.1 Switching On
When the 12V supply is switched on all four LEDs visible on the front panel of the unit will illuminate twice for a
period of one second on each illumination. The blue LED will then go out, when the internal GPS starts
outputting valid position information the red LED will go out and the NAUTICAST-B unit transmits its first
position report (message 18) and the yellow LED will go out; note that this process may take up to 30 minutes
depending on the switch-on state of the GPS receiver. When the yellow LED goes out the green LED will
illuminate indicating that the unit is now operating correctly.
3.2 Warning And Fault States
If the unit has not been able to transmit a position report during the last expected two reporting intervals (i.e. the
nominal reporting interval cannot be maintained for operational reasons such as a Message 23 quiet period,
high channel load conditions, etc) the yellow LED will illuminate. This is a warning condition only and indicates
that your vessels position is not currently being reported to other vessels. Reception of other vessel AIS
information by the NAUTICAST-B is not affected. When the unit is able to commence reporting the yellow LED
goes out.
If a fault occurs the red LED will illuminate. This may illuminate briefly if the power supply is interrupted or if the
VHF or GPS antenna characteristics are briefly affected.
If the Red LED illuminates continuously the unit should be assumed to be faulty and should either be switched
off (power removed) or if this is not practical any other vessel position information derived from the unit should
not be used and it should also be assumed that the unit is not transmitting valid position information for your
vessel.
The unit should be examined by a competent equipment maintainer at the earliest opportunity.
More details on LED indications can be found in
SECTION 8.6.
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Y1-03-0222 Rev T4T4
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