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.
Finished the circumnavigation in early February in Grenada. Have to work on a book project for the next several months so the boat will be waiting for next year.