Gong buoy wani nau'in taimakon kewayawa ne ko alamar da ake amfani da shi a cikin kewayar ruwa. Wani buoy ne wanda ke sanye da gong ko kararrawa wanda ke yin sauti lokaci-lokaci, yana ba da gargadi ga jiragen ruwa ko kwale-kwale a kusa. Gong buoy yawanci angila ne zuwa benen teku kuma ana amfani da shi don alamar shoals, reefs, ko wasu haɗari ga kewayawa.
