I have Nuvi 310 what have bluetooth, but supports some whones only,,
got it english map installed from Bkk 26500thb, so far i have riven and really tryed to get loost in here(Ubon area) but just cant, have all the smallest rds and really clea instructions,, also tried in to my bike last night, suction stand is soo powerfull that i stick it to my speedo meter and drive to home 40Km with speed 103(according to GPS) and it's sticks like a clued to there.
also instructions heard via head set inside helmet where clear.