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Chapter 4: Using the Chart 91
Datum
For your GPS and chart to correlate accurately with your paper charts, they will need to
be using the same datum. The default datum for your display is WGS1984. If this is not
suitable, you can change the setting. When you adjust the datum of the C-Series
Display, a Raymarine GPS will automatically correlate. If you have a third party GPS,
you will need to correlate this separately.
CAUTION:* Changing the chart datum does
not
cause any waypoint or routes
stored in the chartplotter to move on the display, although their latitude and
longitude changes to reflect the new datum.
When adding waypoints numerically to the waypoint list, or via SeaTalk or
NMEA, it is important that they are referenced to the same datum to which
the display is currently set.
Chart Offset
This feature allows you to move the position of the chart in order to correct for position
errors in the cartography. This adjustment is indicated as a distance north/west (+ve)
or south/east (-ve) from your vessel position to a maximum of 1000m. To view the
effects of an offset you can turn the feature on/off. Once calculated, the offset is
applied to all charts.
Track Interval
Options available depend on setting in Record Vessel Track By
function:
TIME - specify time period between track points creation.
DISTANCE - specify distance between track points creation.
AUTO - no options available
TIME selected:
1 sec
5 secs
10 secs
30 secs
1 min
3 min
5 min
10 min
30 min
DISTANCE selected:
0.1 nm
0.5 nm
1.0 nm
Datum
Grid moves according to datum selected and the lat/lon of carto-
graphic features change. System attempts to set up any GPS to the
new mode and indicates whether successful or not. See additional
information below.
WGS 84
List of datum provided
Chart Offset
Moves the position of the chart in order to correct for position
errors in the cartography. See below for further information.
ON
OFF
FUNCTION
Description
OPTIONS
(Default in bold)
81221_4.book Page 91 Tuesday, February 28, 2006 5:24 PM