when you go into the app settings and turn on the proximity dectection, there is a location button that you can click on and it will pull up a map that looks just like any google map, then it has a big blue circle that you can increase or decrease the size of the area you want it to "sense" you in, i have mine set on about a 2-3 mile area with my home being the center of it. now i have it set that wide because it isn't an exact science so it gives the app enough time to recognize that i am in the "zone". it works flawlessly on my phone, just wish it worked that way on my wife's. but who knows, hopefully it will just start working. LOL