Paper is the most reliable...the two pathways I described also serve our needs with hiking, kayaking, and backpacking in rather remote areas. That, and in a former life I modeled logistics-transportation networks..so geeking out a little with data manipulation and mapping is entertaining..and occasionally useful.

I managed to download some data that gives the lat-lon of something like 14,000 public campgrounds in the USA and Canada(national parks, forests, recreation areas, COE, utility, military, county parks, city parks, state parks, state forests..............). When planning a trip/tour I use the google maps workup to plot the route on the campsite map to see what campgrounds might be near the route... or I adjust the route as needed. Sometimes it can be hard..or at least very tedious, to find small campgrounds unless you specifically look at local county/city websites, one by one.. There may be a guide that has all this info(I don't have one). Working up the data electronically is easy and fast.