Another problem with the GPS quickly became apparent with the eTrex, it doesn’t get good reception in the Xterra because the roof blocks half the sky. And the eTrex doesn’t come with an external antenna plug. Luckily others have already countered and fixed this problem with a Re-Radiating Antenna.
What the Re-Radiating Antenna does is take the signal with a receiver antenna on the roof, route it into the cabin and use a second transmitting antenna to broadcast the signal to the GPS. Plus the transmitting antenna is connected to power so the signal can be boosted before being transmitted. The end result is a better reception inside the car than outside.