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16. NAVIGATION SENSORS
16-9
Speed used by the system is shown at the top-right position on the chart radar dis-
play.The figure below shows the source of water speed is used for drift calculation.
Alert related to SOG, COG, speed and heading components
It is possible that the operator has not chosen any speed or heading sensors, or that
the chosen sensors do not have any valid values. This kind of a situation is critical for
the system, because it cannot even perform dead reckoning.
When no heading source is available, the system generates the Alert 450 "Heading
Sensor Not Available."
When no speed source is available, the system generates the Alert 453 "SDME Sen-
sor Not Available." When no COG/SOG data is available, the system generates the
Alert 279 "COG/SOG Not Available."
Speed
used by
this
system
Water Stabilization
Mode Selected
Manual
speed
Selected and Manual
set drift exists
Manual speed
+
Manual set drift
Selected and no manual set
drift exists
Selected and No manual set
drift exists
LOG
(Water speed)
Not selected
Selected
Selected
No valid data exists
Selected
Bottom Stabilization
Mode Selected
Not selected
No valid data exists
Selected and
Manual set drift
exists
Manual speed
+
Manual set drift
LOG
(Ground speed)
GPS
Reference SPD
(local only)