Pretty poor
There’s not much here but pictures and locations. The locations for at least a few are not accurate enough to be an aid to navigation. $2 wasted.
Directions?
How do I access turn by turn directions as advertised? I feel like I just paid $2.00 for a picture app . . .
Good start
This has the most important part; the map & route. A swell addition would be including the historical markers, perhaps look to the Texas historical marker apps for inspiration.