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Have you tried Organic Maps for walking or cycling routes?

No one walks in Mountain View or most of the US so product management doesn't understand the use case.

I image it would be hard do transit maps if you weren't connected to get the schedule.

They already get them somehow while "online". Offline with beginning & end times and a rough idea of frequency should be good enough for local use.

Offline road maps are subject to construction/seasonal/holiday route closures/deviations too, and so is transit.

Road closure tends to be much more rare. Transit is much more variable in the US.