Navigation Chart Settings; Understanding Chart Data - Garmin GPSMAP 420 Owner's Manual

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Navigation Chart Settings

To access additional settings or options for the navigation chart,
press MENU.
Full Screen Map (Show Numbers)—view the navigation or fishing
chart in full-screen mode, without numbers. Select
to view numbers again.
Full Screen Map

Show Numbers
Show Numbers
WEATHER—turn NEXRAD weather data on or off.
NOTE: You must plug the optional GXM 31 antenna into the
XM port on the back of the unit and have a subscription to
XM WX Satellite Weather to view NEXRAD data. XM is only
available on the GPSMAP 430x/430sx/440x/440sx units. For
more information on XM weather, see the GXM 31 Owner's
Manual.
Overlay Numbers—show or hide cruising, sailing, navigation, and
fishing numbers on the navigation or fishing chart.
Chart Setup—customize the navigation chart. See
Chart Notes—access detailed chart information.

Understanding Chart Data

BlueChart g2 Vision and the US inland lake electronic charts use
graphic symbols to denote map features. These symbols follow the
standards of US and international charts. Other features common
to most charts include depth contour lines (with deep water
represented in white), intertidal zones, spot soundings (as depicted
on the original paper chart), navigational aids and symbols, and
obstructions and cable areas.
page 16.
GPSMAP 400 Series Owner's Manual
®