FishNinJay
SILVER Star
Today install on the roof rack the GA29 GPS marine ext. antenna ( picture with the light blue marks) for my Garmin 376c...as you can see in the pics the signals and accuracy change in big time, have to said that the gps was on the driver seat for test mode ( factory ant shows with the red marks deleting my location) ,not on the windshield mount and maybe thats why show little bars on the satellite´s signals but not much difference its was on the mount.
Eshu, why would you install GPS? I've never seen a photo of your rig on an actual road! I'm guessing your Garmin will always be saying "Not on digitized road"

Is this a special GPS made just for your rig?
"Turn left at next rock"
"Drive over tree and river for 2 miles"