The Fin app is used to find, locate and unlock surfboard and paddle boards rentals in the greater San Diego area. Users can find trailers on the home screens map that have surfboards and paddle boards locked up with blue tooth padlocks. The Fin app can then unlock the bluetooth padlocks and start a rental timer. Rental rates are $2 to start and 10 cents a minute. The rental timer stops once the user unlocks a bluetooth padlock to lock up their board when they are finished.