How can I get Google Maps on Android to show metric units?
I'm in Canada and recently made a road trip to the states.  When I'm planning a trip starting in Canada, the whole trip is in km, even if it crosses into the US.  If the trip starts in the US, however, it shows everything in miles, even if it crosses into Canada.  It appears that it's not the location set in your phone but rather the location of the phone itself (if using "my location" as the departure point - otherwise it's just the departure point).

You can try this out by plotting a trip from a "miles" country to a "km" country and then clicking the reverse trip.  The units changed with me.