I have had mixed results here in California (live in SoCal). Of course I have a Verizon Pre2, so the GPS might be flakier than in other models. Works OK for me most of the time in Southern California, but there is a freeway here where it wants me to make a bunch of turns even though I only need to go straight (nowhere near another fwy), and the GPS signal strength is 4 bars.
When I went to San Francisco it was sending me in circles, when I was trying to navigate downtown. It was just about unusable there, as I think the voice navigation can fall behind when there are too many turns. YMMV.
I am using the Navit maps that I downloaded directly from the Navit Maps app a couple of years ago, so they may not be the best or most up to date either.
-- Sent from my Palm Pre using Forums