SKIPPER - DL21 Speed Log

The SKIPPER DL21 is a Dual Axis Doppler Speed Log and a Single Axis Doppler Speed Log in one sensor unit. It is working on the doppler principle, providing longitudinal and transversal ship’s speed (STW and SOG) and distance relative to sea water. The SKIPPER DL21 gives accurate navigation parameters, measured as they happen, and presented in a logical, user friendly way.

The new DL21 Speed Log is designed for ships over 50.000 GT with simultaneous and independent measurement of speed through water and speed over ground. This is according to new IMO resolution MSC334(90).


Number of Axis 2 and 3
Speed range longitudinal +/-50  knots
Water track (from) 2  meter
Accuracy (Better than) 0.2 or 2% whichever is greater  knots
Temperature accuracy Better than 1  °C
Display 9" Touch and dot LED display
Mounting dimensions  190x119x114  mm
Standard cable length for display Any  m
Standard cable length for sensor 40  m
Bottom mounting options
Sea Valve:
Single bottom Yes
Double bottom Yes
Speed alarms - High and low speed limits
- Power failure
- Sensor failure
  • 3 x LAN (IEC61162-450)
  • 8 x NMEA 0183 (IEC61162-1)
  • 5 x Auxiliary (pulse, limit etc.)
  • 2 x Relay (alarm etc.)
  • 3 x LAN (IEC61162-450)
  • 3 x NMEA 0183 (IEC61162-1)
  • 3 x Auxiliary (alarm and sync)
Accepted NMEA formats
Speed VBW, VHW
Distance VLW
Others MTW (temp)
Power supply AC: 115 - 230 V 50/60 Hz 
DC: 24 V
Power consumption Max. 30 W for complete speed log
Language English
Certified for MED B (Wheelmark) MSC334(90), IEC61023, IEC60945, IEC61162-1/2/450, IEC62288 and ready for IEC61924
Service Available in most major harbours, world-wide through extensive dealer network