I stand by my statements. There's no back lit transmissive display made that's anything but faint in bright sunlight. The purpose-made outdoor transreflective displays are actually better in sunlight than indoors. The brighter the sun, the clearer the display. Regarding battery life, you're comparing 20 minutes a day against 10 hrs full on, non stop, all day use of an outdoor GPS? Your GPS and your display (especially if it's full-on trying to overcome sunlight) would waste the battery very quickly. I do acknowledge the downnloading of maps allows you to turn the phone off, but it's display and GPS that depletes battery more than the radio.