why did old (like 90s/2000s) GPS take up to 15 minutes to get a lock, in giant bulky units, but my running watch gets it in 15 seconds?
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One thing I don’t think anyone has mentioned is that modern chips in smartphones, watches etc will often have support for the other navigation systems too. This greatly speeds up getting a lock and also increases accuracy.
For example my Pixel 6 Pro supports GPS, GLONASS, BDS, GALILEO and QZSS.
If you install this app: https://play.google.com/store/apps/details?id=com.android.gpstest
Then you can see the different systems and satellites your phone is picking up.
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