Storm Cell And Lightning Information; Hurricane Information - Garmin GPSMAP 640 Manual

Marine Mode: Using XM WX Weather and Audio
3. Select Menu > Change Weather.
4. Select a different weather chart.

Storm Cell and Lightning information

Storm cell icons on the Precipitation screen indicate both the present
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position of a storm and the projected path of that storm in the immediate
future.
Red cones appear with a storm cell icon, and the widest part of each cone
points in the direction of the projected path of the storm cell. The red
lines in each cone indicate where the storm will most likely be in the near
future. Each line represents 15 minutes.
Lightning strikes are represented by lightning bolt icons
appears on the Precipitation screen if strikes were detected within the last
seven minutes. The ground-based lightning detection network detects
cloud-to-ground lightning only.
2

Hurricane information

The Precipitation screen can show the present position of a hurricane
a tropical storm, or a tropical depression. A red line stemming from a
hurricane icon indicates the projected path
dots on the red line indicate the projected location of the hurricane in 12-
hour intervals, as received from the weather data provider.
. Lightning
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GPSMAP 640 XM WX Satellite Weather and XM Satellite Radio Supplement
,
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of the hurricane. Darkened
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