I've built some very extensive royal blue GPS custom maps for Garmin GPS units that support custom maps and bird's Eye maps.
The files are .Kmz format and you simply connect the garmin to a computer via USB and copy them to the Garmin's /GARMIN/MAPS folder.
I took the offical Royal blue trail maps scanned them and broke them into many high resolution 1024 grids. Then geo refferenced them all.
There are also several POI added and I've got accompanying tracks for many of the main trails.
I tested them on July 4th weekend by riding the trails using them. They appear to be dead on accurate.
I've got about 40 hours into georefferencing and verifying them. I'm trying to finance another trip down to map the un-marked trails. Those interested can send me an email. I'm asking for a 20$ donation via paypal. Once you pay I will send you additional maps as I update them.
I'll also convert any printed trail maps you have to .KMZ files and have some other popular ATV trails converted.
email me if interested to
raleigh@raleighburns.com