Keep backlighting on when you track your movement

By default, backlighting turns off automatically after a specified time to conserve battery power. You can change map options so that backlighting remains on when you track your movement unless the battery power level drops below a specified percentage.
  1. On the home screen, click the Maps icon.
  2. Press the Menu key > Options.
  3. Change the Backlight Timeout When Battery Level field.
  4. Press the Menu key > Save.