Buoyage

noun

1. A series of buoys or floating beacons, for the guidance of vessels into or out of port, etc.
2. The providing of buoys.
3. Buoys, taken collectively; a series of buoys, as for the guidance of vessels into or out of port; the providing of buoys.
4. any of several codes of practice under which buoys of various shapes and colours are used for the same navigational purpose