Get the free MVUM (Motor Vehicle Use Map) for the Spring Mountain National Recreation Area for starters. It is the ONLY official map that shows what trails are open to what type of use. It is available at the US Forest Service/BLM office...
Las Vegas Field Office
4701 North Torrey Pines Drive
Las Vegas, NV 89130
Office hours: 7:30 am-4:30 pm, M-F
It also available online (I can't find the link at this time), but I think it's difficult to read, and useless when you get in the field and need it.
Something else to be careful of is the Benchmark maps recommended above are great, except they don't show wilderness boundary lines and you can get into a heap of trouble being in a wilderness with a vehicle, whether it's marked on the ground or not. It pays to know where you are!
At the above address, you can also get BLM surface recreation maps that show where the roads and wilderness area boundaries are. This is troublesome to me as the maps are expensive at about $5 each, I've got a suitcase full of 'em, and I don't have everything I need yet! These are also the official maps that the law enforcement rangers use. On the plus side, it shows where every open trail and road is and you will likely find places to go that few others do. They include recreation information like petroglyphs and official rock collecting areas if that's up your alley.
Good info. I have been researching trails and I have two sources that you may consider:
First is Gaia GPS (I have the iPhone/iPad app, but they also make an Android version too). I have been using it since I was turned onto it in 2012. Excellent product with MANY layers (maps) and the best thing about it is that you can easily download any of the maps to your device for offline use. I've used it in Death Valley, Fort Irwin, the Mojave Natl Preserve, Moab, etc without cell service and it works like a champ. Keep the phone plugged into a charger and you have a tailored/exact location reference at all times. The two iPhone screen captures below show what some of the relevant map layers that you can use have (when you have the GPS going, it will show your location in the center as an icon). Maps are scalable down to 1:12k normally.
Second reference are two books that others have recommended (but I cannot attest to since I haven't purchased them yet...but I intend to shortly).
Great Basin SUV Trails Vol 1: Southern Nevada (2005 publishing) by Roger and Lois Mitchell
Nevada Trails Southern Region (2011 publishing) by Peter Massey
Good luck to you, but those are additional options for your kit bag.
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