I don't know if this will help but a GPS really needs a line of sight to the overhead satellites. With that said, some GPSs are more susceptible to dropping out than others. I had one GPS that went blank when I entered the I-10 tunnel in Mobile, AL, but its replacement either faked it (or something) because it continued to "show me where I was. My guess is it KNEW this was a tunnel so just faked it under the correct assumption that I'd be out of there in a couple of minutes.
Possible alternatives are using an outside antenna that may SEE better, or go old school and rely on a paper map!
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former 2008 Jayco Eagle 29.5 RLS
former 2014 F250 6.7 4X4, CC LB
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