OTR-300 Drifter Buoy


The low profile 300 buoy series from Ocean Trek Research is a rugged and extensible buoy design, available with a number of standard or customizable sensor configurations.  The 300 series uses the Inmarsat satellite network for bi-directional communications.  The end-user interacts with the buoy via a personal and secure web page; where buoy data can be viewed on an interactive map and a series of commands can be sent to the buoy (e.g. alter the reporting frequency, poll for position, turn a sensor or light on…)  Both internal and external sensors can be accommodated.


  • High Accuracy GPS Positioning
  • INMARSAT D+ Satellite Network
  • Internal Sea Surface Temperature probe
  • Bi-directional Communications
  • Alkaline or Lithium Batteries
  • Fully Integrated with Custom Web-based Mapping Software
  • High Intensity Recovery Beacon
  • Standby, Operational and Recovery modes
  • Magnetic Power Switch


  • External Sea-Bird 39 Temperature Recorder
  • Global Water Turbidity Sensor
  • Tether Attachment (bridle line affixed to the buoy)
  • Wet-matable Connector for Exterior Sensor Communications
  • Customize Your Sensor Package Working with our Experienced Engineers



  • 259.1 mm (10.2 in) total height
  • 396.9 mm (15.6 in) width (top)
  • 5.1 kg (11.25 lbs) positive buoyancy in sea water
  • 10.47 kg (23.1 lb) in air
  • Pressure resistant to 15 meters depth


  • INMARSAT D+ Sat 202 satellite modem
  • GPS 50 channel <1sec hot/29 sec cold acquisition
  • Operating temperature -40 to 70 C
  • Private, digitally encoded data burst signals
  • Programmable
  • Internal SST thermistor
  • Fully integrated with custom on-line mapping software