As GPS-based services get increasingly popular (Nokia recently joined the game with its Smart2Go release), Symbian-Guru prepared a mini site to compare 3 free Java-based navigation apps. 
Testing “equipment” included Nokia E62 and a Nokia LD-1W BT GPS Receiver. He tested amAze, Nav4All, and MGMaps.
As nothing in life is free, these applications download maps as you drive, so you will use a lot of data. Therefore, it is suggested that you have an unlimited data package before using any of them.
I don’t want to spoil Symbian-Guru’s article by revealing the winner. You’ll have to find that out for yourself. Here’s the link. 🙂