TomTom 6 works well for me with a GPT-801 receiver
http://www.gopass.com.tw/Product/GPT...S_receiver.htm
but as was said, a stand-alone GPS device is probably the better choice since the cost of software and receiver for your phone is ~$150 and you will have to remember to bring that BT receiver with you too. Wish there were more phone models like the TyTN II with built-in GPS around!