8 GPSMAP 640 Owner’s Manual
Marine Mode: Using Charts
Marine Mode: Using Charts
The GPSMAP 640 is loaded with both a basic worldwide imagery
map and detailed BlueChart
®
g2 offshore cartography for US
waters.
In addition to the preloaded maps and charts, you can use
optional BlueChart g2 Vision
®
preprogrammed SD cards to get
the most out of your GPSMAP 640. For more information on
BlueChart g2 Vision, see page 11.
There are four ways to view charts on a GPSMAP 640 device:
Navigation Chart—displays an overhead view of the basic
worldwide imagery map, the preloaded BlueChart g2 charts
(GPSMAP 640), and the optional BlueChart g2 Vision charts
and photos.
Perspective 3D (or Mariner’s Eye 3D)—displays a view from
above and behind your boat for a visual navigation aid
(page 10).
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•
Fishing Chart—removes navigational data from the chart and
enhances bottom contours for depth recognition (page 12).
Fish Eye 3D—
provides an underwater view that visually
represents the sea oor according to information on the chart
(page 12).
NOTE:
Mariner’s Eye 3D, Fishing Charts, and Fish Eye 3D
views are only available when using optional Blue Chart g2 Vision
preprogrammed SD cards. See page 11.
Using the Navigation Chart
From the Home screen, touch Charts > Navigation Chart.
Use the Navigation chart to plan a course (see page 14), to view
map information, and as a visual aid while navigating.
Panning the Navigation Chart
1. From the Home screen, touch Charts > Navigation Chart.
2. Touch and drag the chart to view other areas on the chart.
3. Touch Stop Panning to return the Navigation chart to your
current location.
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