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16. NAVIGATION SENSORS
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[Passed] (green): Data is available for comparison and data is normal
[Doubtful] (yellow): Data is not available for comparison, but data is normal.
[Failed] (orange): Data is quite away from predicted value based on a comparison.
[Excluded] (orange): Data is greatly changed compared with predicted value.
[Not Available] (orange): Sentence status or mode indicator is abnormal.
For heading data, If there is only one gyro, the judgement is "Doubtful" when the ship
is stopped because there is no COG for comparison. When the ship begins to move,
the judgement is changed to "Passed" because there is COG for comparison.
The methods of integrity monitoring are outlined in the table below.
The status and integrity of all sensors can be monitored from the [Filter Status] page
in the [Other Sensor Settings] menu. Sensors can also be unselected and the filter re-
set from this page.
The [Status] column indicates sensor status as follows:
• [Selected] (sensor selected for use in filter)
• [Unselected] (sensor not used in filter)
• [Not Available] (no sensor information)
• [Excluded] (automatically excluded sensor)
The [Integrity] column indicates sensor integrity as either [Passed] (green characters)
or [Failed] (red characters). The integrity evaluation is [Doubtful] (yellow characters)
when there are no other sensors to compare with.
Sensor Comparison
Position • Comparison with other position sensors.
• Comparison with dead reckoning position.
Heading • Comparison with other heading sensors.
• Comparison with a COG sensor (used only if other heading sen-
sors are not available and if COG is high enough).
Speed over the
ground
• Comparison with other SOG sensors.
• Comparison with water speed sensors is a secondary option (used
only if other SOG sensors are not available).
Speed through
the water
• Comparison with other STW sensors.
• Comparison with STW sensors is a secondary option (used only if
other STW sensors are not available).
Rate of turn • Comparison with other rate of turn sensors.