The Garmin demo maps are garbage.
The Lake Vu cartography is excellent in real-world use. I use it in a 741XS that I am extremely pleased with. I love the touch screen, it works just like my iphone. I also love the way the unit plots a route by working backwards from a destination starting with a straight red line that ends at your current location. First you touch the desired destination on the screen and a menu pops up with the option of "route to", which you click on. Next you just slide the chart towards your boat, drag the line around obstacles, and click "add turn", until you get to your boat. It is ridiculously easy and intuitive.
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