I got a chance to walk through the ruins Pompei with the Garmin 910xt in tow. Despite having traveled from San Francisco, CA to Pompei, Italy, the Garmin picked up satellites very quickly, and, as you can see below, happily mapped our walk through ruins:
More (and photos!) to follow. Happily the 910xt did a much better job than the 310xt on finding its place in the universe, despite my attempts to confuse it by flying half way around the world.