Something to keep in mind if you are considering using the PN-60 in your Xterra. It has no external antenna connection. I have used a PN-40 for a couple years - but mainly on my quad and dirt bike. It will not pick up a signal in my metal-roofed rigs so I am using a Garmin Nuvi loaded with topo maps and connected to a Gilsson magnetic-base antenna that sits on the roof and gives me max signal strength on all satellites. You might consider a Montana as one of the other posters suggested, or other unit with an external antenna connection port.