Datum Marker Buoy (DMB)


The Datum Marker Buoy is a search and rescue device that is able to track water current direction and speed.

DMB Datasheet

Product Information

The Datum Marker Buoy is a battery powered search and rescue transmitter designed for deployment at sea from either a surface ship, fixed-wing aircraft or helicopter. The buoy utilizes a water brake system that allows deployment in water as shallow as 15 ft.


  • Automatic activation
  • No scheduled maintenance
  • Hand deployable from aircraft or surface vessels
  • May be tethered
  • May be stored up to 10 years without batteries


  • Waterproof: 30 feet
  • Transmitter range: 25,000 sq. miles (typical)
  • Air drop speed: up to 200 knots
  • Air drop altitude: 200 to 500 feet
  • Operating life: up to 48 hours
  • Power source: 5 alkaline “D” cells
  • Antenna: vertically polarized, ¼ wave
  • Dimensions: 6 in x 6 in x 26 in
  • Weight: 4.5 lbs

Ordering Information


Part Number

DMB 240.600 MHz, AM

G1- 09-0001-001

DMB 242.650 MHz, AM

G1- 09-0001-002

DMB 156.750 MHz, FM

G1- 09-0002-001