Useful resources & "happy" for China-made GPS 
:
- http://www.pxdxa.com/
- http://www.navitotal.com/forums/forum.php
- http://forum.mobilism.org/viewforum.php?f=626
Please DO NOT email me since I don't own those happy software!
China-made GPS is getting cheaper and cheaper and they are fully "open & unlock" for you to do anything you like 
!
So you may play around and test those software out there at your own risk.
If you like the GPS software, please go buy the respective genuine GPS device !
6"
5"
4.3"