Garmin GPSMAP 640 - Using XM Traffic Information; Traffic in Your Area; Severity Color Code; Traffic on Your Route

70 GPSMAP 640 Owner’s Manual
Automotive Mode: Using XM
Touch Save to save a channel to Presets (maximum of 20).
Touch Delete to remove the current channel from your Presets.
To delete more than one channel from Presets, touch Browse >
Presets > Delete. A list of all your Presets appears. Touch the
items you want to delete. Touch Delete > Yes.
Adjusting the Volume
Touch , and then use and to adjust the volume.
 
Your GPSMAP 640 can receive and use trafc information using
an optional XM smart antenna (such as the GXM 40). When
a trafc message is received, your GPSMAP 640 displays the
incident on the map and can change your route to avoid the trafc
incident.
NOTE:
Garmin is not responsible for the accuracy of the trafc
information. The XM antenna receives signals from the XM trafc
provider and displays that information on your GPSMAP 640.
NOTE:
You can only access the trafc information if the
GPSMAP 640 is connected to an XM antenna and you have an XM
trafc subscription (see page 69).
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in Your Area
When you are receiving trafc information, a trafc icon appears
in the upper-left corner of the Map page. The trafc icon changes
color to indicate the severity of trafc conditions on your route or
the road you are currently travelling.
Severity Color Code
Color Description Meaning
Green Low severity
Trafc is owing
normally.
Yellow
Medium
severity
Trafc is slightly
congested.
Red High severity
Trafc is heavily
congested or
stopped.

When calculating your route, the GPSMAP 640 device examines
the current trafc and automatically optimizes the route for the
shortest time. If a severe trafc delay occurs on your route while
you are navigating, the device automatically recalculates the route.
You might still be routed through trafc if no better alternative
routes exist.