Not surprisingly, my friend Camaraderie, has missed the main point of my post.
That point being, you have no way of knowing whether your position is accurate to within the few hundred feet you mention, or the six hundred feet I mentioned, or worse. For the GPS "fixed" this is not an attack upon GPS, it's actually an attack upon the receivers, and the dumbing down of those receivers for convenience sake. I own a GPS and find it to be a fine navigational tool. IMHO, relying on GPS alone, in a coastal navigation situation, ie..."piloting" is foolish. Darkness alone should be no barrier to navigating coastal, with the plethora of lights along the US coast. Fog, and perhaps haze, would behoove one to haul further offshore, but then you'd not be piloting anymore, and would be using GPS at it's strongest suit-offshore navigation. If I have somehow misconstrued cam's post I am sure illumination, if not conflagration, will soon follow.(g)
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.