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Directional Waverider DWR-G4

Datawell’s smallest directional wave measuring buoy

With a 0.4 m diameter mini-buoy version Datawell completes its range of GPS buoys: DWR-G9, DWR-G7 and DWR-G4, with 0.9 m, 0.7 m and 0.4 m diameters, respectively.

Just like its larger equivalents the DWR-G4 relies on the Datawell principle of measuring waves with a single Global Positioning System receiver (GPS). By now this technique is well-established in oceanography as evidenced by several publications and well-pleased users in the field.

  • Sensor
    wave motion sensor based on GPS
  • Measures
    – wave height for wave periods of 1.6 to 100 seconds
    1 cm precision in all directions (free floating)
    – wave direction
    – water temperature
  • Additional features
    – GPS for buoy monitoring and tracking through HF link
    – internal data logger
    – LED flasher
    – 0.4 m diameter spherical hull of AISI 316
    – 30 days battery life
Wave motion sensor
Sensor single GPS (not differential)
heave 1.6 s to 100 s
direction 1.6 s to 100 s (free-floating)
1.6 s to 20 s (moored)
Precision 0.01 to 0.02 m, all directions (1σ)
(excluding GPS antenna pitch and roll motion)
Calibration not required ever
Exclusion GPS signals do not penetrate through water, occasional data gaps may occur
Exclusion measurements fail at position changes greater than 100 m in less than 100 s, e.g. when used free floating or towed at constant velocities greater than 1 m/s.
Wave data
Data north, west, vertical
Resolution 0.01 m (north 0.02 m, LSB of north is GPS data gap indicator)
Range -20 m to +20 m
Rate 1.28 Hz
Reference WGS84
Spectral data
Frequency resolution 0.005 Hz below 0.10 Hz and 0.01 Hz above
Frequency range 0.025 Hz to 0.60 Hz
Direction resolution 1.5°
Direction range 0° to 360°
Standard features
Integrated data logger Compact flash module 2 Gb
LED flashlight Antenna with integrated LED flasher, colour yellow (590 nm), standard length 35 cm, “Standard pattern”: 5 flashes every 20 s, “Increased pattern”: 5 flashes every 15 s.
GPS position every 30 minutes, precision < 5 m
Material Stainless steel AISI 316
Hull diameter 0.4 m (excluding fender) 0.46 m (including fender)
Weight 17 kg
Batteries operational life 30 days, 1 section of 4 batteries
Type: Datacell RC27G (270 Wh green)
Hull painting Brantho-Korrux “3 in 1” paint system (no anti-fouling)
Optional features
HF link
Flashlight antenna (1.95 m)
frequency range 25.5 MHz to 35.5 MHz (35.5 to 45.0 MHz on request)
transmission range 50 km, for use with Datawell RX-C receiver.
Argos/Iridium SBD satellite communication
GSM mobile communication


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