Originally Posted by WoobaGooba
That was indeed the case in the early days of consumer GPS and Selective Availability, but I believe today that WAAS addresses the repeatability issue.
Also, more accuracy in heading and speed readings is valuable to relatively slow moving sailboats.
I agree. I think the repeatbility of GPS today equals Loran at it's heydey.
The funny thing about selective availability was, at the time, GPS was still such an improvement, that none of us cared that it was off that much. It was still more accurate than any other navigation device available (except maybe Loran in the right area with TD's crossing at nearly right angles).
I can't imagine the chaos that would ensue today, if they ever turned SA back on. Towboat US, Seatow, and salvors would have a field day.