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XM WX Satellite Weather and Cellular Weather

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

connect points of equal pressure. Pressure readings can

➊

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.

➋

➊

Pressure units are shown in millibars (mb), inches of Mercury (inHg), or

hectopascals (hPa).

Colored shading, as defined by the legend

display, indicates the surface temperature of the water.

in the upper-left corner of the

➋

GPSMAP 400/500 Series Weather Supplement