Eli5: Why does gps like waze or Google maps give a certain time and distance, but change the time and distance once you hit navigate?

Question

Eli5: Why does gps like waze or Google maps give a certain time and distance, but change the time and distance once you hit navigate?

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Answer 1

Along with what’s also mentioned, there is your speed. I’m pretty sure before you start traveling, map apps use the speed limit in the equation to figure out ETA. So if you’re going 85 and the speed limit is 70 it will update the ETA accordingly.

I take a lot of road trips and the travel time is almost always on the long end.