Getting to Croatia and the island of Brač:
If you travel by car, bus or train, you need to reach Split or Makarska in central Dalmatia and then take a ferry or a catamaran to Brač. The ferry from Split takes you to Supetar, while the ferry from Makarska takes you to Sumartin. In both cases you will then need to drive to Postira, or hire a local taxi/mini bus.
If arriving on an international flight, you will probably land in Split (although Dubrovnik might be an option). From Split, you can take the ferry, a local bus, rent a car, or take a taxi to Brač. There is also a small airport on the island of Brač.
Middle and long: 43.30485 N, 16.62802 E
Urban middle: 43.28605 N, 16.87109 E
Sprint: 43.37712 N, 16.62822 E