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How to use position alignment
The position alignment function is in order to final adjust the ship position by using Radar echo overlay, Reference
target, radar echo target and ECDIS chart material.
If position alignment is in use, the ECDIS will generate following alarm every 30 minutes to remain user for
alignment: "2352 ChartAlign: over 30 min".
Position alignment by means of the ECDIS
If the radar echo targets and the Reference target's symbols are not exactly overlapping there is either position error
or gyro error or some combination of these errors.
It is possible to do position alignment on the ECDIS display by moving own ship position or by moving ARPA radar
target position. Moving is done by dragging and dropping own ship symbol or ARPA radar target to desired
location. Before you are able to drag and drop, you have to select Enable chart align in Sensor/Position sheet.
Drag and drop means that you take cursor above desired object and press Chart align button. Keep button down
and move own ship symbol or ARPA radar target to the desired position by track ball.
Note, if Radar Echo Overlay is on the ECDIS display when position alignment is done, then
· Mode of Radar Echo Overlay is temporarily changed to "Radar over Chart"
· ECDIS uses temporarily Radar Echo Overlay color also for own ship and ARPA targets symbols
To make position alignment, proceed as follow:
1. Select desired chart material (ARCS or S57).
2. Select suitable radar target manually for tracking or use suitable Reference target file for automatic tracking. To
start monitoring of Reference target use:
Use this button to open
Reference target menu
3. Select Enable chart align in Sensor/Position sheet.
4. Use the track ball of Control Panel to drag and drop principle to overlap a reference target and a symbol or
suitable chart detail. (Drag and drop own ship position to get reference target and chart object to overlap). See
figures below.
Before position alignment After position alignment