In smaller boats like dinghy classes, the rules are very strict. Sometimes the boats may only be produced by one manufacturer. An example is the Olympic Laser dinghy which is one of the most popular sailing dinghies in the world. But others, like the Optimist dinghy, may be built by anyone and some are home built. The Optimist dinghy is also very popular all over the world. However, the measurements are very strict. A boat like the Olympic 470 dinghy may only be built by certain licenced manufacturers.