Summarize this article:

The generally accepted minimum radio control system has two channels. Each pair of units, radio transmitter and radio receiving system, operates on a discrete frequency so that several radio control units can be operated at the same time and location without conflicting with one another. The number of channels refers to the number of functions the set will control directly. The basic two-channel system allows discrete control of the steering on one channel. The second channel operates the sail control which sets the position of the sails. The actual operation of the model is by manipulating the controls of the radio transmitter unit on the shore. The skipper controls the steering and the sails on the model. The model can be sailed as if it were a full-size yacht. The distance to which we can sail our model yacht is limited by the range of the radio transmitter and receiver in the control system and by the capability of the human eye. Visibility is crucial for setting sail trim and course - and also for avoiding collisions.
Know what to expect with radio control. Be aware that the controller will use channels. Learn how to manipulate the controls. Note that you are limited by your visibility.