GPSMAP 640 Owner’s Manual Marine Mode: Using ChartsZooming In and Out on the Navigation ChartThe scale at the bottom of the chart ( ) indicates the zoomlevel. The bar under the number represents the numeric scaledistance on the map.Touch and to zoom in and out on the Navigation chart.Interacting With Objects on the NavigationChart1. Touch a point on the Navigation chart.2. Touch an option:Note: The options that appear are dynamic, and depend on thepoint you touched.Review—view details of the chart objects near the pointer.(Review only appears if the pointer is near multiple objectson the chart—if the pointer is near only one object, the nameof the object appears instead of Review.)Navigate To—view the navigation options (page 14).Create Waypoint—marks a waypoint at the location of thepointer (page 22).•••Information—view additional information about an object oran area of the chart.Measure Distance—view the distance and bearing of theobject from your current location. The information appearsin a window on the upper-left corner of the screen. TouchSet Reference to measure from a location other than yourcurrent location.Note: You can touch and drag the pointer to a new location.Accessing Additional Object or ChartInformation1. Touch an object on the chart or an area of the chart.2. Touch Information, and choose from the following options:Tides—view tide information provided by the tide stationclosest to the object or area of the chart (page 27).Currents—view current information provided by the currentstation closest to the object or area of the chart (page 27).Celestial—view sunrise and sunset almanac data for theobject or area of the chart (page 28).•••••
