Seeking some tips on using BlindSquare

I would greatly appreciate some tips using blind square...
I have noticed that Blind Square does a fantastic job of intersection announcement when traveling in a vehicle. The app is not announcing many pois. If I am in a downtown area for example, I may get 1 or 2 poi announcments within a 45 minute period. I have my announcement fuilter set to all. What am I doing wrong?
Thanks everyone.