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There are lots of good ones, i use Magellan marine one that supports a chart chip that gives you great detail (albeit on a small screen). (And I put it in my ski truck in the off season as it supports great driving directions with routing...I have it with me now in VT while skiing, it is great for finding the nearest resturants, hotels etc ) In the summer, I put in the marine chip and it does all the charting. Many have similar features. No matter what you choose, you want a WASS unit that is waterproof and one that can run on batteries as well as a dash mounted 12V power feed. The chip will give you a lot more detail, just like the big models.
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