Shmap app for iPhone and iPad

Shmap is a messaging application that allows users to leave messages for friends and the public at specific geographic locations. Shmap transforms ordinary messages into moments. Its magic comes from messages that are delivered – either privately, to groups or to the general public – only when the recipients enter a location associated with the message. Connecting digital conversations with PLACE changes the game 
by enabling a new way of communicating.
*Note continued use of GPS running in the background can dramatically decrease battery life.