Chapter 2: Using the display 21To Zoom in or outUse the RANGE button to change the scale of theviewable area. Press ‘IN’ to see a smaller area of thescreen in more detail (large scale). Press ’OUT’ to seea greater area of the chart (small scale).The level of cartographic detail available at different scales variesdepending upon the chart card used. Some charts provide moredetail at smaller scales than others.If you select a chart scale that does not provide cartographic detailfor the chosen area, the chart will use the most detailed level avail-able for the surrounding area and stretch it to fit the selected scale.This means that you will never have blank or hatched areas on thescreen. However minor misalignment of objects may occur wherethey cross the chart boundaries.Display lighting and colorYour display unit has two distinct color palettes, for day or nightoperation. You can also manually adjust the backlight level.Day/Night operationTo select the day/night mode of operation:1. Press the Power key to display the palette select softkey andbrightness level.2. Press the appropriate softkey to select between Day and Nightpalettes.Note: The display saves the current palette when the unit ispowered off. A display set to NIGHT may be difficult to see inbright sunlight.Backlight levelTo adjust the backlight level:1. Press the Power key to display the backlight level bar.2. Use the left / right trackpad keys to adjust the backlight level.3. Press OK to accept the setting and exit the backlight adjustment.81314-1_A Series Reference Guide.book Page 21 Thursday, August 28, 2008 9:23 AM
