* **the disciples had rowed** - Boats usually had two, four or six people rowing with rowers on each side working together. Your culture may have different ways of making a boat go across a large body of water.
* **about twenty-five or thirty stadia** - five or thirty stadia** - "about five or six kilometers." A "stadium" is 185 meters. (See: [[en:obe:other:biblicaldistance]])