i dont think so
where I cant even hook up my external BT handsfree to iPhone
so i doubt the GPS receiver will do the job.

ohh really?
i have a holux GPS as well...but can iPhone install Mapking for Apple software?

any thrid applications Map i can use to i can give it a try
but my opinion the external BT wont work~

even the Wifi Google Map also not tat accurate.....

i can give it a try if u have to 3rd party GPS map for me to route