Furuno FMD-3100 Operator's Manual page 248

18. NAVIGATION SENSORS
Speed used by the system is shown at the top-right position on the chart display.The
figure below shows the source of water speed is used for drift calculation.
Water Stabilization
Mode Selected
Not selected
(Water speed)
Bottom Stabilization
Mode Selected
Reference SPD
(local only)
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."
18-8
Selected and
Manual set drift exists
Manual
speed
Selected and
Manual set drift
LOG
exists
No valid data exists
LOG
(Ground speed)
GPS
Not selected
Manual speed
+
Manual set drift
Selected and no manual set
drift exists
Manual speed
+
Manual set drift
Selected and No manual set
drift exists
Selected
No valid data exists
Selected
Selected
Speed
used
by
this
system