You should be able to find a nice Garmin eTrex Legend (the blue ones) on eBay used for less than or around $50. Its a hand held, but you can get a mount for dash or bike. It will do breadcrumb trail, etc. I mainly use it for hiking, orienteering and geocaching, but it should work great for that kind of mapping also.
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'02 TJ 2.5l 5-speed, "Red"
'98 XJ 4.0l Auto, "Black Dog"
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