Ability to make bearing lines for use with triangulation of things such as radio transmitters or forest fires etc.
"Triangulate" would be neat on the drop down tool list.
I can almost do this as is but the process is difficult. I actually don't even remember how I did it.
There are other programs out there but they require google services to be running on the phone which I have removed and/or can't use custom offline maps.
And Oruxmaps is just a better map program to use said feature with anyway.