Assertion: buoy | /r/ObjectUse | used in navigation
Facets:
value: for hundreds of years
type: TEMPORAL
Source sentences:
text: Buoys have been used in navigation for hundreds of years, and they serve a multitude of functions, ranging from warning systems to alert navigators to dangers like reefs to data collection devices for government weather agencies like the National Oceanic and Atmospheric Administration (NOAA) in the United States.