Sonobuoy

A sonobuoy (a portmanteau of sonar and buoy) is a relatively small buoy - typically 13 cm (5 in) diameter and 91 cm (3 ft) long - expendable sonar system that is dropped/ejected from aircraft or ships conducting anti-submarine warfare or underwater acoustic research.

Sonobuoy

A sonobuoy (a portmanteau of sonar and buoy) is a relatively small buoy - typically 13 cm (5 in) diameter and 91 cm (3 ft) long - expendable sonar system that is dropped/ejected from aircraft or ships conducting anti-submarine warfare or underwater acoustic research.