no working gps on a spirit 475

Hello, i have put igo on a mio spirit 475, and everything works, but not the gps, how can i let this work. If i go to the igo settings for the gps, the sys file, is says,

[gps]
port=7
baud=57600
default_latitude=43.32942
default_longitude=21.92375
source=nmea
set_messages=0

I cant find anything in the navman settings, only a tmc map wit a big list, but no info.
Wat can i do to let the gps work, or find it faster.
Thanks for any help.