Well, it works....reasonably well. – GPS Data – Coordinates & Speed Review

I’m revising an earlier review where I didn’t think it worked on an iWatch. In fact is does but it takes a long time to start and when it does the speed readout is really small. It’s accurate but what good is it if you have to hold your watch close enough to read the speed. Not useful for us. The display on the iPhone is nice and large so we use that. It’s in an airplane so big numbers are useful especially in turbulence.
Review by TSNewhart on GPS Data – Coordinates & Speed.