This app was mentioned in 4 comments, with an average of 1.50 upvotes
Nintendo zone finder is pretty good. Is homepass still working for you? It hasn't worked for me since around October :(
It is called Nintendo Zone Finder. it is made by 'chackle', not capitalized and was free.
https://play.google.com/store/apps/details?id=com.robcas.nintendozonefinder&hl=en