T/O,
If you decide to go the Tablet route, there are a few bits and pieces that you might consider. I have BCN and have been running on a Samsung Tablet. I have one up from the least expensive and it works great. To keep it running, I bought a rubberized protective case off Amazon. It's not an Otter Box but it has provided adequate protection. We run in the desert and Sierra Nevadas so excessive rain is not a problem, but it is protected from the occasional light rain and mud splash. The other important protective element is a good screen protector. Again I bought it on Amazon. This is the one I use.
Amazon.com: Supershieldz for Samsung Galaxy Tab A 8.0 inch (2017) (SM-T380 Model Only) Tempered Glass Screen Protector, Anti Scratch, Bubble Free: Computers & Accessories
In addition, I installed a USB charging port so I could power the tablet and not have to rely on it's battery.
In addition to the maps, the Tablet is also my technical library. I have manuals for my RZR, my cameras, and any other gadget that I play with.