How many do you get now? I usually get about 4 downtown to 7-8 in the suburbs. AFAIK you never get more than 8 at a time and the navi needs 4 to know where exactly it is.
It would be VERY surprising if you saw any satellites in an underground garage. That's too tough a test - GPS antennas need a clear view of the sky because the signals are very weak.audi1 said:underground garage