Recently I bought a Chinese GPS unit which has 7 inch display, a 600 MHz processor, 128 MB RAM and running Windows CE operating system. First I thought it as a simple GPS unit. But after going through various forums I realised that we can modify the GPS unit to do various functions. Actually manufacturers of the GPS units lock their Windows operating environment to do several defined tasks. Like GPS, calculator, movie player and MP3 player. But there is actually an Windows environment running beneath what you see. You can actually unlock it to get the maximum out of your unit. After unlocking your unit you can install software of your choice.
Back to the GPS functionality of my unit, it is actually very sensitive and has a good signal reception, it runs on SIRF 5 GPS processor. One of the best processes in the current market. My GPS is made by the company called ERODA. Their unit appeared actually very good.