Originally Posted by bac
I also saw that unit, but I do see a possible flaw. What about when one is cycling under trees, or other overhanging features? I think the GPS unit will flake in those instances. Anyone????
As I understand it the bike-specific GPS units also have a magnet on your wheel and (optionally) an internal compass. When the signal from the satellites is lost it uses the wheel magnet for speed and a guestimate of your position, a technology borrowed from high-end automotive GPS systems.