Garmin GPSMAP 8530 Black Box Owner's Manual - Page 27

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 Wind Barb Wind Speed 20 knots 5 knots 50 knots 10 knots 65 knots 15 knots Wave Height, Wave Period, and Wave Direction Wave heights for an area appear as variations in color. Different colors indicate different wave heights, as shown in the legend. The wave period indicates the time (in seconds) between successive waves. Wave period lines indicate areas that have the same wave period. Wave directions appear on the chart using red arrows. The direction of each arrow pointer indicates the direction in which a wave is moving. Viewing Forecast Sea Conditions Information for Another Time Period 1 Select Weather > Menu > Weather Menu > Change Weather > Sea Conditions. 2 Select an option: • To view forecasted sea conditions for the next 12 hours, select Next Forecast or , and to view forecasts up to 48 hours, in 12-hour increments, select Next Forecast or again. • To view the forecasted sea conditions for the previous 12 hours, select Previous Forecast or , and to view previous forecasts, up to 48 hours ago, in 12-hour increments, select Previous Forecast or again. Viewing Fishing Information The weather Fishing chart shows present water temperature, present surface pressure conditions, and fishing forecasts. Select Weather > Menu > Weather Menu > Change 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 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. Pressure units are shown in millibars (mb), inches of Mercury (inHg), or hectopascals (hPa). Colored shading indicates the surface temperature of the water, as shown in the legend in the corner of the display. Forecasting Fish Locations You can show areas that contain optimal weather conditions for specific species of fish. 1 From the weather Fishing chart, select Menu > Weather Menu > Fish Species. 2 Select a species of fish. 3 Select On. 4 Repeat steps 2 and 3 to show areas with optimal weather conditions for additional species of fish. Shaded areas indicate optimal fishing areas. If you have selected more than one species of fish, you can select a shaded area to view the fish species that are included in the shaded area. Visibility Information Visibility is the forecast maximum horizontal distance that can be seen at the surface, as shown in the legend on the left of the screen. Variations in the visibility shading show the forecast change in surface visibility. Select Weather > Menu > Weather Menu > Change Weather > Visibility. Viewing Forecast Visibility Information for Another Time Period 1 Select Weather > Menu > Weather Menu > Change Weather > Visibility. 2 Select an option: • To view the visibility forecast for the next 12 hours, select Next Forecast or , and to view forecasts up to 48 hours, in 12-hour increments, select Next Forecast or again. • To view the visibility forecast for the previous 12 hours, select Previous Forecast or , and to view previous forecasts, up to 48 hours ago, in 12-hour increments, select Previous Forecast or again. Viewing Buoy Reports Report readings are taken from buoys and coastal observation stations. These readings are used to determine air temperature, dew point, water temperature, tide, wave height and period, wind direction and speed, visibility, and barometric pressure. 1 From a weather chart, select . 2 Select Buoy. Viewing Local Weather Information near a Buoy You can select an area near a buoy to view forecast information. 1 From a weather chart, select a location on the chart. 2 Select Local Weather. 3 Select an option: • To view present weather conditions from a local weather service, select Current Conditions. • To view a local weather forecast, select Forecast. • To view surface wind and barometric pressure information, select Sea Surface. • To view wind and wave information, select Marine Bulletin. Creating a Waypoint on a Weather Chart 1 From a weather chart, select a location. 2 Select Create Waypoint. Weather Overlay The weather overlay superimposes weather and weatherrelated information on the Navigation chart, the Fishing chart, and the Perspective 3D chart view. The Navigation chart and the Fishing chart can show WX radar, height of cloud tops, lightning, WX buoys, county warnings, and hurricane warnings. The Perspective 3D chart view can show WX radar. Weather overlay settings configured for use on one chart are not applied to another chart. The weather overlay settings for each chart must be configured separately. NOTE: The offshore Fishing chart is available with premium charts, in some areas. SiriusXM™ 21