I found this page https://help.gaiagps.com/hc/en-us/articles/115003639928?input_string=map+legends which contains some map legends. There are numerous other maps for which there isn't a legend on this link. For example the Nat Geo Maps and the NPS amongst others.
I think it would be super helpful to also allow the user to download the legends of their choice to be used on IOS or Android for offline usage.
We're waiting on an official map legend from NatGeo, but in the meantime, I've added an unofficial one to the article you linked above.
For the NPS maps -- CalTopo (the digital map creator) doesn't provide a legend, however, you can see a legend directly on some of those map sections if you zoom in on them in the app.
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