Position Alignment; How To Align Position; How To Cancel Position Alignment - Furuno FMD-3100 Operator's Manual

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 the actions listed below occur.
• 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.
Note: The filter can also be reset from the context-sensitive menu. Right-click any-
where in the [Own ship information] box to show the context-sensitive menu then se-
lect [Reset Filter].
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 640 "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 mov-
ing radar target position. To align position, get into the Voyage navigation mode, click
the [Offset] button at the top-right position on the screen, put the cursor on the correct
position then click. The amount of offset, in bearing and range, appears 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.
18.8.2

How to cancel position alignment

Click the [Offset] button to cancel the position offset.
332.5° 10.0NM
18. NAVIGATION SENSORS
18-11