I answered you here
http://www.navitotal.com/forums/showthread.php?1574-satnav-problemcause you ask asme question there! I don't know what rom he, you, etc. used on that device, and i don't know is it ok or not ok rom, i can give you answers just for oficially roms, for customizing roms, i'll can't help you, for all problems that kind contact author of rom, cause maybe problem is with rom. Like i wrote on link above, you can read that you can try to setting your gps port and baudrate, but you have to know default values of these settings, and then to try to get gps signal, and for that device is better to use garmin xt for older device, cause that device is too old - 7 years!
Try with these values
gps port:COM 2, baud rate: 4800.
You can look here some more info about problem with gps signal on your device...
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