Visibility Information - Garmin GPSMAP 640 Manual

Forecasting Fish Location
You can show areas that contain optimal weather conditions for specific
species of fish.
1. From the Home screen, select Weather > Fishing > Menu > Fish
Species.
2. Select a species of fish to display optimal fishing areas for that species.
3. Repeat step 2 to show areas with optimal weather conditions for
additional species of fish.
Shaded areas indicate optimal fishing areas. If you have selected more
than one species of fish, select a shaded area to view the fish species that
are included in the shaded area.
GPSMAP 640 XM WX Satellite Weather and XM Satellite Radio Supplement
Marine Mode: Using XM WX Weather and Audio

Visibility information

Visibility is the forecast maximum horizontal distance that can be seen at
the surface, as shown in the legend
in the visibility shading show the forecast change in surface visibility.
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Viewing Visibility information
From the Home screen, select Weather > Visibility.
Viewing Forecast Visibility information for another Time
Period
1. From the Home screen, select Weather > Visibility.
2. Complete an action:
• Select Next Forecast to view the forecast visibility for the next
12 hours, and select Next Forecast again to view forecasts for the
next 24 and 36 hours, in 12-hour increments.
on the left of the screen. Variations
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