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User Name	Thread Name	Subject	Posted
leeneia	BS: GPS and Maps (55* d)	RE: BS: GPS and Maps	01 Apr 17
Friends of mine were visiting cousins in a town with a name like "Jersey Shore." Their GPS took them from the interstate to a highway, from the highway to a gravel road, and from the gravel road to the ocean. Apparently it wanted them to drive into the water, but they didn't. GPS is useful, but don't trust it completely. ========= The DH has been reading a book about relativity. GPS satellites go so fast that engineers have to consider relativistic effects in their calculations. They circle the earth fast that time slows down for them. (I think.) This may be the only aspect of our daily lives where relativity matters. If not, it's the first one I've known about.

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