If you have an Aux. input you could install a small computer(say a mac mini) and run a GPS through it. This would not be the cheapest route though, $200 for a GPS $499 for a mac mini, $20-$100 for a power inverter.
2001 TJ, 4.0, 2.5" OME, JKS Discos, MM e9000, AtoZ Rockers, Skidrow Oil/Engine, Serveral custom WV pin stripes
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