It's not unusual to lose signal indoors , in fact most portable /car devices receive very little, if any, signal indoors.
I have a Navman ICN510 running TomTom 6.0 software , instead of the standard Navcar CE program. I believe it connects much faster.
Below is a support forum for modding Navman GPS units.
It will teach you how to change the software on your navman & also help with any other problems. It was very helpfull to me !!
Click here for the Naman Forums !!!!
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