Post #3665300
2026-07-08 01:08 UTC
A friend of mine is doing that crazy long walk up the sierras (he's done 1048 miles), had his Pixel 10 in AIRPLANE MODE for days, and of course no wifi to sniff, and the clock drifted off more than one hour. So GPS stuff becomes not usable.
My first thought was that GPS provides accurate clock but my second was, I don't really know how GPS nav works.
Replies (1)
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@ewenmcneill@cloudisland.nz 2026-07-08 06:07
@tomjennings@tldr.nettime.org GPS is timing correlation of transmissions from N of M satellites. If you know your location fairly accurately you can get time from that. If you know the time fairly accurately you can get location from that. If you know neither you’re in coldstart, which is very slow, because you have to guess at which satellites you might see, on which frequencies, when. And do successive approximation of time and location.