19. Navigation Sensors
19-20
19.8.2 Resetting position alignment
To reset position alignment, proceed as follows:
1. Open the Sensors dialog box and then open the Position page.
2. Uncheck “Chart Align”.
.
.
Spd/Cse
Posn
3. Check that the indication OFFSET is not shown in the upper part of the information area, to the right of the
position source indication.
59
°
31.206'N
024
°
36.731'E
WGS 84
DGPS
HDG 071.0°
SPD
(CALC)
1.8 Kt
SB
(POSN)
1.7 Kt
COG
(POSN)
045.1°
SOG
(POSN)
2.0 Kt
19.8.3 Position alignment by ARPA radar
A user chart, showing coast line, buoys, etc., can be used as a position reference once the ARPA radar is able to see
these objects. If the ARPA radar targets and the user chart are not exactly overlapping there is either position error
or gyro error or some combination of these errors. This feature can only be performed on ARPA radars which are
able to display a user chart.
Position alignment with ARPA radar which has a CHART ALIGN button
1. Display user chart on the ARPA radar.
2. Press the CHART ALIGN button on the ARPA radar display once. Then, use the trackball on the ARPA radar
to move the user chart so that it overlaps radar echoes correctly. Press the CHART ALIGN button again once.
Then the amount of alignment is transferred to the ECDIS.
If the position source is dead reckoning, the position set with chart alignment is the new start position for dead
reckoning. In this case there is no offset and no OFFSET indication in the information area. If the position
source is something other than dead reckoning, then the indication OFFSET is displayed at the upper part of the
information area, to the right of the position source.
59
°
31.960'N
024
°
39.577'E
WGS 84
DGPS
OFFSET
HDG 070.0°
SPD
(CALC)
1.8 Kt
SB
(POSN)
1.7 Kt
COG
(POSN)
045.1°
SOG
(POSN)
2.0 Kt
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