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Maritime and inland navigation buoys are classified according to their location. ① Maritime buoys. ② Inland buoys, used in river and lake waters. They include markers for channel and route identification, such as river crossing markers, shoreline markers, guide buoys, river crossing guide buoys, head and tail guide buoys, bridge and culvert markers; markers for hazards, such as triangular buoys, floating drums, lightships, left and right navigational buoys, and rod buoys; and indicators for water depth, overhead and underwater pipelines, wind forecasts, and traffic control in narrow channels, like depth signal poles, passage signal towers, horn markers, boundary markers, cable markers, crosscurrent buoys, and wind signal poles. While different countries have variations, the overall designs are similar. In China, inland navigation buoys on the right bank are painted red, emitting red light at night; those on the left bank are painted white, emitting white or green light at night. Modern navigation buoys are mostly automated, electrified, and digitalized, with radio remote control and surveillance replacing manual on-site operations.