I've designed a simple device that implements the Racing Rules of Sailing audible start signals. It costs about $200 to build and it is open source hardware and software. My feeling is that many clubs can put together a group of sailors with the skills to build one. I will build one for you if you want to pay for nominal labor and shipping costs. All of the details are available at http://voojibox.com/, including links to software source code and hardware drawings.