Position Alignment; Position Alignment By Means Of The Ecdis - Furuno FEA-2807 Operator's Manual

19.9

Position Alignment

The position alignment feature functions to fine-tune ship's position by using radar overlay, radar echo target and
ECDIS chart material.
If position alignment is in use, the ECDIS will generate the following alert every 30 minutes to remind the operator
to align position: "342 ChartAlign: over 30 min".
19.9.1

Position alignment by means of the ECDIS

If the radar echo targets' symbols are not positioned correctly, there is either position error or gyro error or some
combination of these errors.
Position may be aligned on the ECDIS display by moving your ship's position or by moving a Tracked Target's
position. Moving is done by dragging and dropping your ship symbol or Tracked Target to desired location. Drag
and drop means that you place the object on desired location by rolling the trackball while pressing and holding
down the left mouse button then "anchoring" the object by releasing the left mouse button.
Note: If the radar overlay is on the ECDIS display when position alignment is done, then
•
Mode of radar overlay is temporarily changed to "Radar over Chart".
•
ECDIS temporarily uses radar overlay color also for your ship and Tracked Target symbols.
To align position, do the following:
1. Select desired chart material (ARCS or S57).
2. Select suitable radar target manually for tracking.
3. Put the cursor on the position indication in the information area then push the right mouse button to display the
Sensors dialog box. Open the POSN page, then check Enable chart align.
SPD/CRS POSN
Chart align
DR
4. Use the trackball and the left mouse button to drag and drop a symbol or suitable chart detail on a radar target.
See figures below.
Before position alignment
NM
After position alignment
19. Navigation Sensors
19-15