I use the Globalsat BR-355 and it worked very well even through tints in my hatch. I never went under 4 sats and usually saw 6-8. I currently have it mounted on the dash behind my registration and I've never gone under 7 sats. Even if you go with this gps unit, I would suggest putting it on your dash. Better to be in the front of your car anyway as your turn indicators would be a little more accurate.