User's Manual

Table Of Contents
NACOS Platinum
ED 3100 G 140 / 04 (2011-11)
Operating Instructions
III-3 Permanent Area for Navigation
III Main Applications.fm / 10.11.11
III-48
The entire track and chart synthetics move by an amount equal to the position offset. With
other words the own ship's position jumps on the screen (the PPI / chart area) exactly by that
offset.
The position offset that is entered continues to be displayed in the Adjust dialog.
In this way, each direction (N/S and E/W) can be corrected by up to 999 m.
The LAT / LON data are marked with the manual input symbol as long as a position offset
is applied.
5. Check that the other symbols of the chart and the AIS target symbols too now coincide as well as
possible with their radar echoes. If necessary, the steps 2 to 3 can be repeated to correct the posi-
tion offset.
Deleting the Position Offset
The position offset can only be deleted manually by clicking on the Adjust button and entering 0 m for
each direction.
The position offset is not deleted automatically when a different position sensor is selected.
If the entire video has a rotational displacement relative to the chart, this indi-
cates that there is probably a compass error which cannot be deleted by a posi-
tion offset. Either the synchronisation within the compass system is inadequate
(this must then be corrected) or the compass system itself has a static or dynamic
course error. This should, if possible, be corrected in the compass system.
Check regularly whether the position offset is still valid, especially after a change
of positional accuracy from DGPS to GPS and vice versa or after selection of
another position sensor.
When the watch is changing over, the selected offset must definitely be pointed
out to the new officer of the watch.