Greetings ALL.... First timer here. We own several overland rigs all built here at our fab shop in Tucker Ga. We are getting ready to put a new one out on the road. Its a fully customized 2004 Nissan Frontier 4x4 crew cab with a ton of bells and whistles... We have upgraded the factory stereo system with all new Polk Audio speakers, small Kicker subwoofer recessed into the floor under the drivers seat, a small 5 channel amplifier. The only thing we are lacking now is a head unit. We have been searching (unsuccessfully) for an AM/FM stereo with built in GPS but we do NOT want cell tower based GPS. We are hoping that some company makes an ACTUAL Satellite based GPS head unit. Meaning a unit that is not dependent on cell tower signal but instead relies on a TRUE SATELLITE signal for its GPS function. Does anyone know if this particular unicorn exists?? Thanks!!!