I'm not sure why you are saying the GPS performs poorly in the 8800. I found it to be extremly accurate- it does as well as any of my Garmins. I currently have loaded the Garmin, Mapquest and Telenav software on my 8800 and my 8820 and have had them loaded for months. They perform flawlessly with the usual GPS accuracy. By the way I bought all programs because I couldn't decide which was better.
Jim