18. NAVIGATION SENSORS
18-11
• [Excluded] (automatically excluded sensor)
The [Integrity] column indicates sensor integrity as either [Passed] or [Failed]. The in-
tegrity evaluation is [Doubtful] when there are no other sensors to compare with.
The [Comparisons] column shows the sensors compared and the integrity evaluation
of compared sensors in parentheses. Using the illustration above as an example,
SOG/COG data fed from GP0002 is compared with the sensors GP0001 and VD0001.
The integrity evaluation for the compared sensors is [Passed].
To unselect a sensor manually, select the sensor from the drop-down list at the bot-
tom left corner of the page, click the [Unselect] button then click the [Save] button. [Un-
selected] appears in the [Status] column. To reselect an unselected sensor, select the
sensor from the drop-down list, click the [Select] button. [Selected] appears in the [Sta-
tus] column.
The [Reset Filter] button functions to recover from sensor failure. When the button is
operated:
Note 1: The filter can also be reset from the context-sensitive menu. Right-click any-
where in the [Own ship information] box, then select [Filter Reset].
Note 2: The filter reset feature resets all units connected in the network.
18.8 Position Alignment
The position alignment feature functions to fine tune ship's position by using radar, ra-
dar echo target and ECDIS chart material.
If position alignment is in use, the Alert 30803 "Chart Align: Over 30 Min." is generated
every 30 minutes to remind the user to align position. The alert is automatically erased
in 10 seconds.
Note: This feature is effective with the ECDIS unit whose data source for FILT is as-
signed the highest priority.
18.8.1 How to align position
If the radar echo targets' symbols are not positioned correctly on the chart, there is ei-
ther position error or gyro error or some combination of these errors.
Position may be aligned on the ECDIS display by
moving own ship position or by moving radar target
position. To align position, get into the Voyage navi-
gation mode, then click the [Offset] button at the top-right position on the screen. (You
are asked if you want to align position; click the [Yes] button to proceed.) Put the cur-
sor on the correct position then click. The amount of offset, in bearing and range, ap-
pears to the right the [Offset] button. The maximum offset in distance is 10.0 NM.
The latitude and longitude position indication is shown in yellow characters when the
position align feature is active.
• Automatically excluded sensors are re-included.
• All data history is erased.
• Output values are re-estimated using new data.
• Integrity monitoring is restarted using new data.
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