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Garmin GPSMAP 820xs Manual

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Viewing Fishing Information
The weather Fishing chart shows present water temperature,
present surface pressure conditions, and fishing forecasts.
Select
Weather
> Fishing
.
Surface Pressure and Water Temperature Data
Surface-pressure information appears as pressure isobars and
pressure centers. Isobars connect points of equal pressure.
Pressure readings 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.
Pressure units are shown in millibars (mb), inches of Mercury
(inHg), or hectopascals (hPa).
Colored shading indicates the surface temperature of the water,
as shown in the legend in the corner of the display.
Forecasting Fish Locations
You can show areas that contain optimal weather conditions for
specific species of fish.
NOTE:
This feature is not available on all devices and in all
subscriptions.
1
From the weather Fishing chart, select Weather
> Fishing >
MENU > Fish Species
.
2
Select a species of fish.
3
Select
On.
4
Repeat steps 2 and 3 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, you can select a
shaded area to view the fish species that are included in the
shaded area.
Changing the Sea Surface Temperature Color Range
You can change the color range dynamically to view higher
resolution sea surface temperature readings.
1
From the weather fishing chart, select MENU
> Sea
Temperature
.
2
Select an option:
• To allow the chartplotter to adjust the temperature range
automatically, select Auto Configure.
The chartplotter automatically finds the lower and upper
limits for the current screen, and updates the temperature-
color scale.
• To enter the lower and upper limits for the temperature
range, select
Lower Limit or Upper Limit, and enter the
lower or upper limit.
Visibility Information
Visibility is the forecast maximum horizontal distance that can be
seen at the surface, as shown in the legend on the left of the
screen. Variations in the visibility shading show the forecast
change in surface visibility.
NOTE: This feature is not available on all devices and in all
subscriptions.
Select Weather > Visibility.
Viewing Forecast Visibility Information for Another
Time Period
1
Select Weather
> Visibility
.
2
Select an option:
• To view the visibility forecast for the next 36 hours, in 12-
hour increments, select
Next Forecast or
multiple times.
• To view the visibility forecast for the previous 36 hours, in
12-hour increments, select Previous Forecast
or
multiple times.
Viewing Buoy Reports
Report readings are taken from buoys and coastal observation
stations. These readings are used to determine air temperature,
dew point, water temperature, tide, wave height and period,
wind direction and speed, visibility, and barometric pressure.
1
From a weather chart, select .
2
Select Review
> Buoy
.
Review
does not appear if the cursor is not near an object. If
the cursor is near only one object, the name of the buoy
appears.
Viewing Local Weather Information near a Buoy
You can select an area near a buoy to view forecast information.
1
From a weather chart, select a location on the chart.
2
Select
Local Weather.
3
Select an option:
• To view present weather conditions from a local weather
service, select Curent Cond..
• To view a local weather forecast, select Forecast.
• To view surface wind and barometric pressure information,
select
Sea Surface.
• To view wind and wave information, select Marine
Bulletin.
Creating a Waypoint on a Weather Chart
1
From a weather chart, select a location.
2
Select
New Waypoint.
Weather Overlay
The weather overlay superimposes weather and weather-related
information on the Navigation chart, the Fishing chart, and the
Perspective 3D chart view. The Navigation chart and the Fishing
chart can show weather radar, height of cloud tops, lightning,
weather buoys, county warnings, and hurricane warnings. The
Perspective 3D chart view can show weather radar.
Weather overlay settings configured for use on one chart are not
applied to another chart. The weather overlay settings for each
chart must be configured separately.
NOTE:
The offshore Fishing chart is available with premium
charts, in some areas.
Turning On the Weather Overlay on a Chart
From the Navigation chart or Fishing chart, select MENU
>
Chart Setup > Weather > Weather > On
.
Weather Overlay Settings on the Navigation Chart
From the Navigation chart, select MENU > Chart Setup >
Weather.
Weather: Turns on and off the weather overlay.
Precipitation: Shows precipitation data.
Cloud Cover: Shows cloud cover data.
Buoy Data: Shows weather buoys.
Legend: Shows the weather legend.
Weather Overlay Settings on the Fishing Chart
From the Fishing chart, select MENU
> Chart Setup > Weather
.
Precipitation: Shows precipitation radar.
Sea Temperature: Shows sea temperature data.
Buoy Data: Shows weather buoys.
Legend: Shows the weather legend.
SiriusXM Weather 31
… 37 …


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