5. When using a map loaded to a data card, you can viewdetailed information about an individual map, highlight theMap Name, and press ENTER. Highlight OK, and pressENTER to exit the Map Information Page.6. To select/deselect individual maps (data card maps only) tobe shown on the Map Page, highlight the box next to the mapyou want, and press ENTER to check/uncheck the Showbox.ORPress MENU, select one of the options (Show All, Hide All,or Show Defaults), and press ENTER.7. Press QUIT to exit the Map Information Page.Map OrientationThere are three map orientation options: North Up orients the maplike a paper map. Track Up orients the map in the direction of travel.Course Up orients the map so the direction of navigation is alwaysup. When using Track Up or Course Up, the north arrow indicatesthe orientation. To change the map orientation, press MENU to openthe Map Page. Press MENU again. Select Set Up Map, and pressENTER.Zooming In and Out of the MapThe map has 28 available map zoom ranges ranging from 20 ft to800 nm (20 ft to 800 mi or 5 m to 1200 km). The map zoom range iscontrolled by the IN and OUT keys, with the current range shown atthe bottom right of the data window.NOTE: The range value represents the distance from one end ofthe range bar ( ) to the other.To select a map zoom range (zoom in and out):Press the OUT key to zoom out; press the IN key to zoom in.Both the GPSMAP 378 and GPSMAP 478 have a built-in worldwideland database. The GPSMAP 378 contains detailed maps of the USinland lakes and the GPSMAP 478 contains built-in BlueChart g2charts. The GPSMAP 378/478 shows cartography as long as chartinformation is available for the map zoom range you selected.GPSMAP 378/478 Owner’s Manual 41MArIne Mode PAges > MAP PAge
