[. . . ] Press to toggle the main screen modes, and use the soft keys to select the required window or a full-screen display. [. . . ] Press PLACE EVENT to place event symbol at the vessel's position. Press EXIT to finish. PLACE EVENT SELECT SYMBOL DELETE EVENT EXIT Trackpad Press the edge to move the cursor on the chart or in the menus POWER Press to turn on the display. Press for 3 seconds to turn off the display. Soft keys Press to select the indicated function, or scroll round a menu list. If no labels are displayed, press any soft key to display the default soft key labels. Labels change when you press a dedicated key, as shown above the keys. MENU Press to display the Main Menus, with the last-used option highlighted. Use the soft keys or trackpad to highlight the required option, and press ENTER. [. . . ] The key either performs the selected task, accepts changes, or leads to a display of further options. BRIGHTNESS BRIGHTNESS + NIGHT VIEW CLEAR Press to cancel an operation or display, and return to the previous display. BRIGHTNESS CONTRAST RayChart 620 and 630 Quick Reference Guide BRIGHTNESS BRIGHTNESS + CONTRAST CONTRAST + 86043_1 [. . . ]