Just reading this post....Not sure if you made a move yet. I use an app on Android called LocusMaps, and purchased a trail map system from California Trail Maps. It has been extremely accurate for me so far, with trails all around central and southern California. I have the maps already, and would be happy to share them with you.
You can pick up a cheap tablet pretty much anywhere and load these maps up on it, and mount it in your X. The maps work offline, so you wouldn't need an internet connection. A few nice additions are when you have internet, you can save your files in the cloud in case of loss of data. Also, if you record a trip, you can share it with others who are using the same or similar programs, so others can drive the same route you did, making it much easier and convenient if you have never been on that route before. I've recorded TMR and Cerro Gordo for example, and would feel extremely confident on its accuracy to navigate the trail on my own.
Lots of options out there, just another one in the tool belt.