The width of the sonar window can be changed. Combo View Depth Cartography Sonar Window Bearing of Boat with Respect to True North Water Surface Temperature Speed of Boat Map Scale 20 Chart Orientation Both Chart and Combo views allow you to choose the orientation of the chart. When North-Up orientation is selected, True North is shown at the top of the display. In other words, objects located to the north of the boat are drawn above the boat. When Course-Up orientation is selected, the directio