Learning the HARD way...
Join Date: Jan 2007
Location: Boston / Ft Myers Area
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Because I used to travel for work (now unemployed and looking), I bought a Garmin GPSmap 478 last year. I still love it. It has all the charts for the entire coastal US, and all the roadways throughought the US (the maps for Boston are accurate). It is also water(proof/resistant) to IPX7. To use in the car or motorcycle, I select "Automotive," and everything pertaining to road navigation (Street names, speed in MPH, Time to next turn, voice prompts, etc.) is set. To use on the boat, I select "Marine," and everything pertaining to marine navigation (Speed in Kts, AToN, Course, heading, anhor drag, etc.) is set.
There is a inland lake version of the unit, the GPSmap 378 with all of the AToN for inland navigation.
The only issue may be price, (currently about $750).