I use the Watch Duty app every day and it is an excellent tool.
Where did you get the map that you attached? Is that from the app?
I see watchduty does have the map but I stole the map initially from the NPS Facebook page.

Black Canyon of the Gunnison National Park
Black Canyon of the Gunnison National Park. 58,500 likes · 17,197 talking about this. Black Canyon of the Gunnison National Park preserves one of the deepest, steepest, and narrowest canyons in the...