I have been forced off viewranger which in my opinion was the ultimate map app and instead offered the use of the inferior outdoor active. There really is no comparison generally, but in summary these are some of the issues I cannot as yet resolve. 1. There is no real-time display of OS grid ref coordinates. 2. You cannot have more than one waymark displayed on the map as a small pin. (You can display them all as large icons). 3. The autorotate does not work on my phone (does with view ranger)