Garmin GPSMAP 640 Owner's Manual

Also see for GPSMAP 620: Quick reference guide Declaration of conformity Owner's manual supplement Safety instruction Installation instructions

Contents

GPSMAP 620 and GPSMAP 640 Owner’s Manual 49Marine Mode: Advanced Configuration• World Map—toggle the world map (basemap) between a basicworld map and a full world map.◦ The basic world map shows coastal outlines of the world,with land indicated in yellow.◦ The full world map shows the coastal outlines of the worldwith the land covered in a low-resolution photo image.• Spot Depths—turn on spot soundings and set a dangerousdepth.• Safety Shading (with compatible BlueChart g2 Vision cards)—areas with depths shallower than the specified value are shadedin blue, while areas with depths greater than the specified valueare shaded in white. The contour is always drawn at, or deeperthan, the selected depth. Select Manual to enter the depth.Select Auto to use the depth from the g2 Vision chart.• Symbols—customize the symbols that appear on the Navigationchart.◦ Navaid Size—adjust the size of the symbols shown on themap.◦ Navaid type—set the navaid symbol set: National Oceanicand Atmospheric Administration (NOAA) or InternationalAssociation of Lighthouse Authorities (IALA).◦ Land pois—toggle Points of Interest (POI) icons shown onland (this option is only available when using a BlueChartg2 Vision SD card).◦ Light Sectors—show the sector in which a navigationallight is visible. Select on to show light sectors at all times,or select Auto to allow the chartplotter to automaticallyfilter out light sectors depending on the zoom level.◦ Chart Borders—show what area the maps cover whenusing a BlueChart g2 Vision data card.Understanding How Wind VMG and WaypointVMG Are Displayed in the Data BarsThe chartplotter automatically switches between displaying WindVelocity Made Good (VMG) and Waypoint VMG in the data bars.Waypoint VMG is displayed under the following conditions:• The Route Leg data bar displays Waypoint VMG when you arenavigating a route or an Auto Guidance line.• The Sailing data bar displays Waypoint VMG when you arenavigating a route or an Auto Guidance line, and you turn theRoute Leg data bar off.