Sonny, I just looked at ONX and it shows some of the navigable trails on the base map, but the only pre-loaded, named routes they have are:
Phillips Loop - Shows the loop from Ghost Town Road starting up Mule Canyon then turning up Phillips, then where you come out of Phillips on the edge of Odessa, the loop turns back toward Mule Canyon and rejoins Mule a short distance up from the Phillips/Mule Y at Camp Rock. This is a mostly easy route with one Medium challenge in Phillips Canyon just past the turnoff to Kramers Arch.
Doran-Odessa Loop - This one tracks the route up Odessa Canyon from Ghost Town Road, and you take either Doran or Odessa up, crossover at Bismark/Sweetwater Spring, then back down the other. Both of these canyons are rated difficult, even if you use the bypass to get around the Doran Gatekeeper.
Kramer Arch Side Trail - Not sure why they called it that, other than you can indeed do it on your way to Kramer's Arch if you want. But it's basically the crossover trail through the mud hills from lower Odessa to Phillips Canyon. It can be considered Easy but there are a couple of steep climbs with blind breakovers. Our group would normally use this trail to get from the camp spot over to run up Doran or Odessa, or to return to camp after running either of them in the downstream direction.
Wall Street Canyon Overlook - This one starts up Mule Canyon from Ghost Town Road, then turns up through Tin Can Alley to take easy roads over to Bismark then on to the Wall Street Overlook. The last leg of this route before dropping into upper Wall Street Canyon "might" be difficult or impassable. There's a narrow passage that a few years ago was filled with rock and sand from storm runoff, then a subsequent storm cut a deep narrow gulley through this overburden, making it impassable for normal 4X4s. But it *might* have been traversed and beaten back down somewhat in recent years, and perhaps passable now. If not, a little ways past Bismark you would have to detour up and around another route that is shown in ONX as "Wall Street Canyon Trail", which ironically crosses Wall Street Canyon but doesn't turn down it to go to the overlook. See my notes on it below:
Wall Street Canyon Trail - This one takes what looks like an easier route from Fort Irwin Road and ends at Bismark. So it shares part of the route with the above-mentioned Wall Street Canyon Overlook route. Like I said, the curious thing about this one is that it doesn't actually turn down Wall Street Canyon to go to the overlook. But it does cross Wall Street Canyon a short distance above the overlook, so you can use this route to guide you to the alternate route into Wall Street Canyon that I mentioned in the note above. Simply transition to that route at Bismark, and when you get to where it crosses Wall Street Canyon, simply turn downstream and go the short distance to the overlook. Keep an eye out on the left for the old stone cabin as you head down.
Calico's Shadow - Interesting name for this one. But it's basically the route from the Sweetwater Spring area up to the spot we call "Edge of the World", which Thom (
@ntsqd ) showed us many years ago. If you want to go to Edge of the World, take the Wall Street Overlook route to Sweetwater Spring, then turn up this Calico's Shadow route just past the spring. Take Calico's Shadow upstream as far as it goes. Eventually the same road will transition into a route called "Power Line Trail" on the ONX map. Continue on this a little way further. On ONX you will see the north-south boundary for the BLM land. Just before there, take the dirt road off to the left (not shown as a road on ONX but you can see it in the satellite image) which takes you a short distance up to Edge of the World. This is a worthy destination with probably the best view in the Calicos. Return by the same route. You can also combine this with a trip to Wall Street Overlook. You'll see in ONX how to link the two together. IMPORTANT: Do NOT continue down "Power Line Trail" after the Edge of the World turnoff. The road continues a short distance to a saddle, which you can go check out if you want, and look down into the canyon where the trail continues. But turn around there if you don't want a hard core, very rocky and loose, very steep descent.
That's about it for the named routes that ONX has pre-loaded for the interior Calico Mountains area. It shows several more of the commonly used trails as navigable routes, but unfortunately there are quite a few routes we use regularly, that aren't shown on the ONX overlay map, though you can see them in the satellite image if you have that turned on as your underlay. The road from upper Phillips Canyon, along the rim of Odessa then dropping down into Odessa is an example of this. Likewise continuing up the opposite bank of Odessa and crossing over the front of the mountain to the rim of Doran Canyon as an alternate route to Bismark.
Send that info to your cousin so he can look at his ONX map and see what I'm talking about to familiarize himself with it before the trip.