I don''t currently sail with a GPS on a consistent basis. I work in a boating supply store. Post 9-11 there was a bit of a delay in reading satellites. Then it got back to normal. Now, once more, there seems to be a bit of a delay. But, again, I am not using one daily, this is more on a twice a week or so showing of the products to customers. And, once obtained, the readings seem to be spot on, just takes a bit longer for even the best handheld units to recieve a triangulation.
So, will even itself out in the end, huh?