Experience with Portable GPS Units?

[gerhardwilliams]

I am contemplating purchase of a "portable" GPS unit for use in our coach. I am
concerned as
to whether or not it will operate inside our steel "skin" and with our straight
up and down
windows. The unit picks up the satellite from the rear of the GPS receiver. I
can not try it
first, as sellers will not allow return if unsuccessful. Thus, I ask the forum
if you have any
experience? Thanks, Gery Williams, Lady LeeAnn, 2000LXI, Savannah, Georgia