Samyung ENC SI-30A, Manual Instruction

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4 8
No valid SOG information
No valid COG information
Heading lost/invalid
No valid ROT information
These messages indicate that information from various sensors are not available. In a full
installation it is expected that all this information will be available permanently and the
display of one or more of these messages is an indication that there may be problems either
with the other sensors or with the connections between the sensors and the SI-30A
transponder unit. Such messages should be investigated immediately.
UTC clock lost
This message indicates that internal GPS module within the SI-30A transponder is unable to
obtain a valid time signal. If this message appears on a regular basis it may indicate a
problem with the GNSS antenna connection, but it is possible for this message to occur
temporarily in certain locations or in extreme weather conditions where the GNSS module is
unable to receive transmissions from a sufficient number of satellites.
External DGNSS in use
External GNSS in use
Internal DGNSS in use (beacon)
Internal DGNSS in use (msg 17)
Internal GNSS in
use
These messages indicate which source of GNSS information is currently in use by the
transponder. The external GNSS information from the ship's main onboard systems may or
may not be augmented by differential correction information - in which case the messages
show "DGNSS" rather than "GNSS". When the external GNSS signals are not available, the SI-
30A transponder uses GNSS information from its own internal GNSS module and the
message changes to "Internal GNSS". This information may be augmented by the receipt of
differential correction data from a beacon receiver or by VHF transmissions from a base
station - in which case the status message shows "DGNSS" and "beacon" or "msg 17"
respectively to indicate the source of the differential data being used.