Re: GPS Accuracy - how much is actually needed
I think, as others have stated, that accuracy is entirely a non-issue. Another thought about having the sensor in the boat is reliability. Our VHF has an an internal GPS with an internal antenna and on occasions it will not be able to provide a position. I have never had this problem with any device with an external antenna.
Heading back to Lake Ontario for this summer. Now in Bermuda and heading to Long Island Sound in the first week in May. Then on to the Hudson and the Erie Canal.