talking about the market, "useful" is same as "popular/usage".
though I don't have statistics at hand, DoCoMo and J-Phone's LBSS
traffic are very low.
the response time is an issue, but accuracy is much more important.
cell id won't reliably tell you the nearest station because it can
easily have error of kilometers and give you wrong directions.
I don't think underground is a big issue either because antennas
cover very small area. the weak signal of GPS is a big issue and
downtown buildings cause a lot of problems. then you'll need
assistance from the cdma network.
look around before you decide whether to ask people or satellite.
if there is a young one ... a good chance to practice Japanese.
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Received on Fri Aug 29 13:30:40 2003