Chart Cards; Chart Datum - Raymarine C140w User Reference Handbook

6.5 Chart cards

Chart cards can be used with your multifunction display to provide
chart detail for specific geographic areas.
Your multifunction display is supplied with embedded cartography
that provides a level of detail suitable for basic navigation in a
specific geographic area. If you require charts with a higher level
of detail, or for a different geographic area, it is necessary to
purchase Navionics® chart cards. To check the current availability
of Navionics chart card types and the latest feature sets, visit
www.navionics.com or www.navionics.it. To obtain Navionics cards,
contact your local dealer or visit the Navionics web site.
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6.6 Chart datum

In order for your GPS and chart to correlate accurately with your
paper charts, they must be using the same datum.
The default datum for your display is WGS1984. If this is not
suitable, you can change the setting via the Chart Setup menu.
When you adjust the datum of your multifunction display, a
Raymarine GPS will automatically correlate. If you have an external
third party GPS, you will need to correlate this separately.
C-Series Widescreen user reference