GPSMAP 5000 Series Owner’s ManualUsing XM WX Weather and AudioUSinG XmUnderstanding Surface PressureThis feature shows pressure isobars and pressure centers. The isobars connect points of equalpressure. Pressure readings can help determine weather and wind conditions in an area. Highpressure areas are generally associated with fair weather. Low pressure areas are generally associatedwith clouds and the chance of precipitation. Isobars packed closely together show a strong pressuregradient. Strong pressure gradients are associated with areas of stronger winds.Pressure units are shown in Millibars (mb), Inches of Mercury (in), and Hectopascals (hPa).Understanding Water Temperature DataThe Water Temperature feature indicates the water’s surface temperature, as indicated by the legendon the left of the screen. The temperature breaks are indicated by isotherm lines.Viewing Fish ForecastingThis feature shows areas that contain optimal weather conditions for specific species of fish.1. From the Home screen touch Weather > Fishing > Menu > Fish Species.2. Touch a species of fish. Shaded areas indicate optimal fishing areas.Viewing Visibility InformationVisibility is the forecast maximum horizontal distance that can be seen at the surface, as indicatedby the legend on the left of the screen. Contour lines on the Visibility feature show the forecastedchange in surface visibility.From the Home screen touch Weather > Visibility.
