Just FYI- you could kill 2 birds with one stone here. Get an iPad. It's expensive, but then you have an iPad. Very cool toy when you aren't fishing.
THEN, download "marine charts" app. It's like 30 bucks, and a better chart plotter than most. Doesn't have sonar (obviously) but the gps is awesome and the interface is easy to use. You can actually overlay google earth on the NOAA charts.
For what you would pay for a really good chart plotter, you can get the same function and have an iPad. Biggest downside is the mounting, but if you are a fan of coona$$ ingenuity, a lil epoxy and an iPad dock... Voila!
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