Right now, App doesn't list based on GPS location.
I think there is no need for that.

I aimed & completed primary feature, which is - Reward users for making payments in HBD.
So, you pay a visit to store which accepts HBD. Make payment using this app, and get rewarded.

List of businesses is just a list of supported businesses.
May be in near future, when we have a LOT of businesses, we'll do for sure.