Wouldn't this be a more likely
watch feature?
Possibly indicating that the iWatch will have a public SDK and app store right off the bat, unlike the iPhone which took a year before it got one, or the AppleTV which still lacks one.
Also - I imagine this could have mapping implications. My understanding of GPS is that a single GPS satellite fix will tell you where you are within a sphere, because it only knows your distance. With two GPS satellites, it knows you're within two spheres of possibilities, which intersect to form a circle of possibilities. Further, it knows you're probably somewhere on the surface of the earth, which makes it plus or minus 1 mile of the earth's surface. With a third satellite, you get a pretty exact position.
But if it knows your altitude, then it won't be plus or minus 1 mile of the earth's surface. With just one GPS satellite, you get a circle of possibilities, and with two, you get a pretty exact position.
So it could easily improve GPS, right? Particularly when dealing with elevation changes?