Can anyone comment on how accurate Google Maps is for driving around Hokkaido? I'm considering renting a mobile wifi unit to have internet during our trip and just using Google maps to drive around (we'll be going from sapporo to furano/biei, otaru, shakotan, hakodate, with a stop somewhere undecided between shakotan and hakodate [suggestions welcome]). I'm wondering whether Google maps would be sufficient enough or whether we should just go with the English GPS rental from the car company.
Does anyone have a recommendation for an affordable mobile wifi rental? Is it possible to rent from Sapporo and return in Hakodate?
Lastly, do you think mobile wifi service will be reliable throughout Hokkaido, in terms of being able to access Google maps while we're on the road at all (or most) times?