Garmin GPSMAP 400 Weather and XM Satellite Radio - Manual (Page 12)

XM WX Satellite Weather and Cellular Weather
8 GPSMAP 400/500 Series Weather Supplement
Viewing Forecast Sea Conditions Information for Another
Time Period
Note: This feature is available only if you are receiving XM WX Satellite
Weather data. It is not available if you are receiving only cellular weather
data.
1. From the Home screen, select Information > Weather > Sea
Conditions.
2. Complete an action:
• To view forecasted sea conditions for the next 12 hours, select right
on the Rocker, and to view forecasts up to 48 hours, in 12-hour
increments, select right on the Rocker again.
• To view the forecasted sea conditions for the previous 12 hours, select
left on the Rocker, and to view previous forecasts, up to 48 hours ago,
in 12-hour increments, select left on the Rocker again.
Viewing Fishing Information
The weather Fishing chart shows present water temperature, present surface
pressure conditions, and fishing forecasts.
From the Home screen, select Information > Weather > Fishing.
Surface Pressure and Water Temperature Data
Surface-pressure information appears as pressure isobars and pressure
centers. Isobars
➊
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.
➊
➋
Pressure units are shown in millibars (mb), inches of Mercury (inHg), or
hectopascals (hPa).
Colored shading, as defined by the legend
➋
in the upper-left corner of the
display, indicates the surface temperature of the water.