Since BlindSquare looks up information on your location and your surroundings on Foursquare and Open Street Map, your device must be connected to the internet in order to use BlindSquare.
In a future release we may add a feature that will let you download information about an area so you can use BlindSquare even when you are not connected to the internet. Currently, however, we recommend that you use BlindSquare with a data plan.