40
GPSMAP 640 Owner’s Manual
Marine Mode: Advanced Configuration
Projected Heading
—specify the amount of time ahead of
an AIS target to project the heading of the AIS target.
Details
—toggle AIS details on the Navigation chart on or
off.
trails
—show trails behind AIS icons on the Navigation
chart for a position history of other vessels. Specify the
amount of time behind each AIS icon you want to maintain
a trail.
Stop Navigation
—stop active navigation.
Configuring Navigation Chart Setup and
Appearance
From the Navigation chart, touch
Menu
>
Navigation Chart
Setup
.
Photos
—enable and configure BlueChart g2 Vision high-resolution
satellite imagery. See
tides/Currents
—toggle the tide station icons and current station
icons on or off.
Service Points
—toggle the marine services icons on or off.
Roses
—enable information roses around the boat icon. Touch the
rose you want to view on the chart. Touch
None
if you do not want
a rose to appear on the chart.
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Note:
You must connect an optional NMEA 0183 wind sensor to
view the True Wind and Apparent Wind roses.
Weather
—configure the appearance of weather options on the
Navigation chart. This option is only available when connected
to a Garmin GXM 40 XM antenna device. See
for more
information on interpreting weather features.
Weather
—general weather toggle. Turn all enabled and
available weather features on the navigation chart on or off.
NeXRaD
—toggle the NEXRAD weather overlay on or off.
Cloud Cover
—toggle the cloud cover overlay on or off.
Visibility
—toggle the visibility overlay on or off.
WX Buoys
—toggle the WX buoy icons on or off.
Show Legend
—show the NEXRAD/cloud cover/visibility
legend window on the Navigation chart. Touch the legend
window on the Navigation chart to hide it.
Data Bars
—control how charting numbers appear on the screen.
Choose to show or hide the numbers by category. When set to
auto
, the overlay numbers appear only when that category is
active.
Cruising
: GPS speed and GPS heading.
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