I'd like to know too.
I was really hoping you had a good answer,
BackCountry Navigator TOPO GPS
https://play.google.com/store/apps/details?id=com.crittermap.backcountrynavigator.license
I came across that one a few times last night; think I will end up giving it a shot if I can install it on multiple devices. The paid version at $10 isn't bad.