My AirMap 1000 was preset to 0.1nm radius for 'arrival' at a waypoint, but that might not be the same thing as passing a waypoint and sequencing to the next. I actually set it to 2nm: when it says 'arriving destination', for example, I want to look over the nose and see it, not find it's underneath me!
And anyway, who can fly accurately enough to arrive within 0.1nm (unless you never look out of the window, of course). (Indeed as a new GPS owner I can see the temptation of using it too much: I flew with it for the first time on Wednesday and became fixated for a while with maintaining exact track, but was woken up by a close call with opposing traffic (fortunately a nice controller had called it to me) and realised I should be looking where I was going.)
Tim