Garmin GPSMAP 740/740s XM Supplement - Page 8

XM WX Satellite Weather and XM Satellite Radio Viewing a Marine Forecast or an Offshore Forecast 1. From the Home screen, select Weather > Forecast. 2. Pan the map to an offshore location. 3. Touch a location on the chart. The Marine Forecast or Offshore Forecast options appear when forecast information is available. 4. Select Marine Forecast or Offshore Forecast. Weather Fronts and Pressure Centers Weather fronts appear as lines that indicate the leading edge of an air mass. Front Symbol Description Cold front Warm front Stationary front Occluded front Trough Pressure-center symbols often appear near weather fronts. Pressure Description Center Symbol Indicates a low-pressure center. A low-pressure center is an area where the measured pressure is lowest relative to the surrounding area. Moving away from a low-pressure center in any horizontal direction results in increased pressure. Winds flow counterclockwise around low-pressure centers in North America. Indicates a high-pressure center. A high-pressure center is an area where the measured pressure is highest relative to the surrounding area. Moving away from a high-pressure center in any horizontal direction results in decreased pressure. Winds flow clockwise around high-pressure centers in North America. City Forecasts City forecasts appear as standard weather symbols. The forecast is viewed in 12-hour increments for the next 48 hours. Weather fronts City forecasts  700 Series XM WX Satellite Weather® and XM® Satellite Radio Supplement