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3.6 Led Indicators
3.6.1. Power
This is a green LED which indicates, when lit, that power has been connected correctly to the transponder, that
the transponder hardware has been configured, that the operating software is present, that the CPU has booted
up and the application software is running.
3.6.2 TX Timeout
This is a yellow LED which indicates when lit that the CSTDMA transmitter is prevented from transmitting.
Reasons for this include the following:
The transponder's internal GPS receiver is not operating or is not yet ready. [1] requires that a class B CSTMA
transponder shall not transmit if its internal position sensor is not operating
The transponder was unable to transmit an AIS message due to the channel being already occupied, e.g. by
transmissions from other AIS transponders
3.6.3 Error
This is a red LED which indicates, when lit, one of the following status conditions is possible:
Transmitter lockout timer (1 second maximum) has operated
GPS is unable to gain lock after 30 minutes
VHF antenna VSWR is out of range
Power Supply is out of range
Background noise level is above the threshold level (-77dBm)
3.6.4 Safety Related Message (SRM) Status
This is a blue LED which indicates when lit that the SRM button has been depressed for more than 2 seconds
and the pre-set SRM has been sent. If the SRM LED is illuminated it is not possible to send another SRM. An
SRM can be sent once a second. The payload within the message 14 transmission is the text string "MAYDAY"
by default.
3.6.5 Silent Mode Function (if user configures SRM switch to act as Silent
Mode switch)
This is a blue LED which indicates when lit that the Silent Mode button has been depressed for more than 2
seconds and the pre-set Silent Mode has been activated. If the blue LED is illuminated you are not transmitting
your AIS data to other vessels, your AIS is acting as a receive only device. Depress the Silent Mode button a
second time transmit your position data.
3.7 Antennas
The NAUTICAST-B unit requires VHF and GPS antennas independent from those in use for other purposes.
Please see
Appendix A
4. MAINTENANCE
Unauthorized opening of the NAUTICAST-B system will invalidate the warranty.
WARNING:
CAUTION:
Avoid
can damage the case material. To clean, wipe down with a damp cloth.
for details of the antennae required.
using
chemical
solvents
to
clean
the
NAUTICAST-B
15 of 25
as
some
solvents
Y1-03-0222 Rev T4T4
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