Alarm was raised as MSC Cruises vessel sailed off the coast of ... the Coast Guard aircrew commenced searching and deployed a self-locating datum marker buoy that measures sea currents to assist ...

Among the tools used in the search were three self-locating datum marker buoys (SLDMBs) dropped into the Gulf of Mexico from Coast Guard helicopters.

The Philippine navy recently found a large steel marker bearing Chinese inscriptions and hundreds of yellow buoys in waters near the Reed Bank, an area of the South China Sea where Manila has long ...