Garmin GPSMAP 640 Handbuch - Seite 10
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Marine Mode: Using XM WX Weather and Audio
Viewing Forecast Sea Conditions information for another
Time Period
1. From the Home screen, select Weather > Sea Conditions.
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.
• Select Previous Forecast to view the forecast visibility for the
previous 12 hours, and select Previous Forecast again to view
forecasts for the previous 24 and 36 hours, in 12-hour increments.
Viewing Fishing information
The Fishing screen shows present water temperature, present surface
pressure conditions, and fishing forecasts.
From the Home screen, select Weather > Fishing.
6
Surface Pressure and Water Temperature Data
Surface-pressure information appears using pressure isobars and pressure
centers. Isobars
connect points of equal pressure. Pressure readings
➊
can help to determine weather and wind conditions. High-pressure
areas are generally associated with fair weather. Low-pressure areas are
generally associated with clouds and the chance of precipitation. Isobars
packed closely together show a strong pressure gradient. Strong pressure
gradients are associated with areas of stronger winds.
➌
➊
Pressure units are shown in millibars (mb), inches of Mercury (inHg), or
hectopascals (hPa).
Colored shading
, as defined by the legend
➋
the display, indicates the surface temperature of the water.
GPSMAP 640 XM WX Satellite Weather and XM Satellite Radio Supplement
➋
in the upper-left corner of
➌