[Nissan4Life]

Go to caltopo.com. Build a map with any or multiply layers. Make a pdf of it.

Download avenza or pdfmaps onto your phone. Access the pdf you just made.

Best way for detailed offline viewing. And Free unless you want special stuff. Haven't used for a while.

 

[Nissan4Life]

I think caltopo may not be publicly accessible anymore - use it for SAR, but we have access for that. On my phone I use Backcountry Navigator Pro. Some others use avenza and, as mentioned above you can add PDF maps to that - I believe all of the USGS maps are now digitally tagged so they'll work. You can get them at https://topomaps.usgs.gov/drg/

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Still has it available for public use. The PDFs now have a limited life unless you pay a fee. Seems fair, as this is the most powerful mapping software I have ever used. Where else can you layer USGS topos on top of google earth layers.