
I've been using my 600c after updating from an earlier model. I've seen other GPS units my friends have, but would never trade theirs for mine. I use mine in the car and on my motorcycle. Like no other GPS, it is visible in broad daylight on my bike.
I like the 640x480 resolution - it provides a lot of detail. I also like that the text overlays on the display are programmable. You position what you want, where you want it, and the size you want it to be. And not just the distance to the next turn & a turn arrow; you can optionally display time, speed, battery voltage, total distance, distance to the next stop, and more. As the user, you decide what you want to see and how you want it to appear.
My wife travels a lot, with numerous stops along the way. For her, it is a simple matter of entering the addresses (which is so easy it can even be done while driving - but shame on anyone for doing that!), and then telling the unit to rearrange the waypoints for the most logical route to take. If you decide to take a scenic route, it will notice within a few feet and nearly instantly reroute you. (Other GPS units want you to turn around. I've only heard the 600c say 'make a U-turn' once!)
I also like the MP3 player. I want to listen to music when I travel, but I don't want the GPS to compete with the radio. By having an MP3 player incorporated into the unit, the music automatically pauses when you need to pay attention to your voice instructions for the next turn. I can also manually pause the music when my cell phone rings.
I was reluctant to spend a lot of money on a GPS, but I am glad I bought this unit. It makes driving a much more relaxed experience. Perhaps unfortunately, I have become dependant on the 600c and cannot travel without it!
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Lowrance iWAY 600C GPS.