maps api for distance to coast

I need an app built from any of the maps API that will do the following: 1. Allow me to define the coast of Florida (I believe google polylines allows this) 2. Input an address and export the distance in miles to the closest coast (which i will define) ## Deliverables I am open to all aspects of this project to get it done in a simple and workable forms. The 'coast' or ocean surrounding Florida will be defined differently in different areas (examples including measuring from bays or rivers). You will have to provide me with the means to draw the coast line, then that will be used to measure from. I will be available at all times to discuss. Thank You