B.G., agree on the sonar capability of a chart-plotter. The tablet/phone concept with Navionics app may be worth considering as an inexpensive back up to have on your phone.
As to the hard top, as you know we got the Eastern last summer and it has a hard top. I have an older Standard Horizons CP180i with internal antenna and it works fine in the Eastern. That said, I'll probably look for an upgrade GPS with sonar capability for the new boat.
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