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Yea, I can solve the problem by ordering the up dated CD for maps of the US, this allows me to only use the GPS by regions, not the entire US. It costs $59.00. I am at this time unemployed so I guess I wait for better days.
I inquired of Sony about map updates for my navu-73T after realizing several routes took me way out of the way. I was told "Unfortunately, map updates are not available for your Sony GPS Navigation System at present. If available, it can be purchased from our Parts and Accessories Sales Web site or from the Sony Style Web site. " They provided this site: http://servicesales.sel.sony.com/ecom/accessories/web/index.jsp
By MS Active sync from computer delete file Mounted Volume/my
flash/sony/nav-u.exe (the folder SONY is hidden, you must set show
hidden files in your comuter first). And then replace old navi file by
exe file of total commander CE version ( download is free on site of
developer) .You must rename the totalcmd.exe to nav-u.exe. Now after
reboot is allowed everything, including executing any other navi
software like tomtom, igo, navigon and many other (multimedia players).
The oficial navi (old navigon) by sony is not so good in compare with
new navi soft. .. enjoy.