Viewing Precipitation Information - Garmin GPSMAP A12 Owner's Manual

Viewing Precipitation Information

Precipitation ranging from very light rain and snow, up to strong
thunderstorms, is indicated in varying shades and colors.
Precipitation is shown either independently or with other weather
information.
Select Charts > Precipitation.
The time stamp in the upper-left corner of the screen
indicates the elapsed time since the weather data provider
last updated the information.
Storm Cell and Lightning Information
Storm cell are represented by
chart. They indicate both the present 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
weather precipitation chart if strikes were detected within the last
seven minutes. The ground-based lightning detection network
detects cloud-to-ground lightning only.
NOTE: This feature is not available on all devices and in all
subscriptions.
Hurricane Information
The weather Precipitation chart 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
of the hurricane. Darkened dots on the red line indicate the
projected locations through which the hurricane will pass, as
received from the weather data provider.
Weather Warnings and Weather Bulletins
When a marine weather warning, weather watch, weather
advisory, weather bulletin, or other weather statement is issued,
shading indicates the area to which the information applies. The
aqua lines on the chart indicate the boundaries of marine
forecasts, coastal forecasts, and offshore forecasts. Weather
bulletins may consist of either weather watches or weather
advisories.
To view information about the warning or bulletin, select the
shaded area.
Color Marine Weather Group
Cyan Flash Flood
Blue Flood
Red Marine
Yellow Severe Storm
Red Tornado
Forecast Information
The Forecast chart shows city forecasts, marine forecasts,
warnings, hurricane warnings, METARS, county warnings,
weather fronts and pressure centers, surface pressure, and
weather buoys.
Viewing Forecast Information for Another Time Period
1
Select Charts > Forecast.
2
Select an option:
• To view the weather forecast for the next 48 hours, in 12-
hour increments, select
• To view the weather forecast for the previous 48 hours, in
12-hour increments, select
SiriusXM Weather
on the weather precipitation
. Lightning appears on the
multiple times.
multiple times.
Weather Fronts and Pressure Centers
Weather fronts appear as lines that indicate the leading edge of
an air mass.
Front Symbol
Pressure-center symbols often appear near weather fronts.
Pressure- Description
Center
Symbol
Indicates a low-pressure center, which is a region of
relatively lower pressure. Moving away from a low-
pressure center results in increased pressure. Winds
flow counterclockwise around low-pressure centers in
the northern hemisphere.
Indicates a high-pressure center, which is a region of
relatively higher pressure. Moving away from a high-
pressure center results in decreased pressure. Winds
flow clockwise around high-pressure centers in the
northern hemisphere.
Viewing a Marine Forecast or an Offshore Forecast
1
Select Charts > Forecast.
2
Pan the chart to an offshore location.
The Marine Forecast or Offshore Forecast options appear
when forecast information is available.
3
Select Marine Forecast or Offshore Forecast.
City Forecasts
City forecasts appear as weather symbols. The forecast is
viewed in 12-hour increments.
Symbol Weather
Partly cloudy
Cloudy
Windy
Thunderstorms
Smoke (dusty, hazy)
Viewing Sea Conditions
The Sea Conditions feature shows information about surface
conditions, including winds, wave height, wave period, and wave
direction.
Select Charts > Sea Conditions.
Surface Winds
Surface wind vectors appear on the Sea Conditions chart using
wind barbs that indicate the direction from which the wind is
blowing. A wind barb is a circle with a tail. The line or flag
attached to the tail of the wind barb indicates the wind speed. A
short line represents 5 knots, a long line represents 10 knots,
and triangle represents 50 knots.
Wind Barb Wind Speed
Calm
5 knots
Description
Cold front
Warm front
Stationary front
Occluded front
Trough
Symbol Weather
Fair (sunny, hot, clear)
Rain (drizzle, sleet, showers)
Foggy
Snow (snow showers, flurries,
blizzard, blowing snow, sleet,
freezing rain, freezing drizzle)
Wind Barb Wind Speed
20 knots
50 knots
47