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SKIPPER DL2 Navigation Speed Logs
SKIPPER DL2 Navigation Speed Logs

SKIPPER DL2 Navigation Speed Logs

SKIPPER DL2 Navigation Speed Logs

The SKIPPER DL2 is a Dual Axis Doppler Speed Log, working on the doppler principle, providing longitudinal and transversal ship’s speed (STW and SOG) and distance relative to sea water. The SKIPPER DL2 gives accurate navigation parameters, measured as they happen, and presented in a logical, user-friendly way.

SKIPPER DL2 Display

  • IMO Wheelmarked with MED-B
  • Water speed log in dual axis (STW)
  • Ground speed in dual axis (SOG)
  • Docking functionality as standard (Three axis in STW and SOG)
  • Sea Temperature readout from sensor
  • Touch Display
  • RMRS and CCS available on request
  • LAN and NMEA0183 output
  • User friendly programmable displays and integrated menus
  • Fully automatic settings
  • Resultant Sea Current in Speed and Direction

SKIPPER DL2 Specification

Speed Log: DL2
Number of Axis: 2 and 3
Speed range longitudinal: +/- 50 knots
Speed range transversal: +/-50 knots
Water track (from): 2 meter
Temperature accuracy error: <1°C
Power Supply: AC : 115-230 V 50/60 Hz
DC   : 24 V
Power Consumption: Max 30 W for complete speed log
Display: 9″ touch
Mounting dimensions display: 190x119x114 mm. Bracket or panel mounting
Accuracy (Better than): 0.2 knots or 2% whichever is greater
Accuracy: 1% available as an option
Weight: 1.4 kgs for display
1.5   kgs for electronic unit
10 kgs for sensor and 40 m cable
Standard cable length: None (max 100 m) for display
40   m for sensor
Mounting options: Steel Tank
Aluminium tank
100 mm Sea Valve   for single bottom
100 mm Sea Valve   for double bottom
DL850 540 kHz   retrofit in ETNSLB
Atlas Dolog 2x   retrofit
Sperry SRD   421/500 retrofit
Speed alarms: High and low speed limits
Power failure
Sensor failure
Outputs: 2xLAN (IEC61162-450)
4xNMEA0183   (IEC61162-1)
2xAuxiliary   (pulse, limit etc)
1xRelay (Alarm   etc.)
Inputs: 2xLAN (IEC61162-450)
2xNMEA0183   (IEC61162-1)
1xAuxiliary (alarm, sync etc.)
NMEA Outputs: Speed: VBW and VHW
Distance: VLW
Others: MTW   (Temperature)
Classification: IMO Wheelmarked
CCS on request
RMRS on request.
MED-B
IEC61023, IEC60945, IEC61162-1/2/450, IEC62288 and ready for IEC61924

One full system consist of :

Display option :
CU-M001-SB   Touch
Sensor options :

Sensor Option
Sensor Option
DL2SG-SA for 100 mm Sea Valve
DL2ST-SA for Steel Tank
DL2STA-SA for Aluminium Tank
DL2SDR-SA for Atlas Dolog 2x retrofit
DL2SE-SA for ETNSLB retrofit
DL2SW-SA for Sperry SRD 421/500 retrofit
DL2STR-SA for Steel tank retrofit with diver
Electronic Unit options :
Electronic Unit
Electronic Unit
JB70D2-SA Standard
JB70D2-SA-OPT For extra options
Extra options software :
JB70D2-OPT-1PC – 1% accuracy
JB70D2-OPT-SYNC – Sync features
Bottom housings :
Bottom housings
Bottom housings
SB-100-SB Sea Valve for single bottom
DB-100-SB Sea Valve for double bottom
ETNSTCL Steel Tank
ETNALC Aluminium Tank

Types of Speed Logs

Electromagnetic — These devices, also called EM logs, rely on a coil in an electromagnetic sensor. When the AC current energizes the coil, it creates a magnetic field surrounding the sensor. As a vessel moves through water, an electrical field running perpendicular to the magnetic field is produced. The sensor electrodes detect and deliver the resulting signal representing the ship’s speed to a preamplifier, which then converts it to a digital format for viewing. This process is inexpensive and has the advantage of not requiring any moving parts. However, water salinity and temperature can affect calibration. The water flow slows down closer to the hull due to friction, affecting measurements.

Pitometer — Also referred to as a pit log, the instrument uses the principle of differential pressure to determine an object’s speed through the water. It operates by submerging a Pitot tube with an opening at the base in water. While the tube is stationary, the pressure (known as static pressure) remains constant. When the tube starts moving past the water, it creates dynamic water pressure that varies based on the velocity.  The effect of static pressure is removed to obtain an accurate measurement of the dynamic pressure for calculating the speed. To achieve this, a second tube is installed near the first with an equivalent static pressure. Movement through water does not generate any dynamic pressure in the second tube. The difference between the pure dynamic and static pressure readings indicates the speed of the moving object.

Doppler — Doppler transducers rely on the Doppler frequency shift effect for estimating the speed of a moving body. A transducer produces high-frequency sound pulses toward both ends of a vessel using two transmitter windows. The reflected pulses are detected by two receiver windows located in the transducer. The time delay between the transmitted signals confirms the receipt of echoes from undisturbed water surrounding the object. The vessel’s fore/aft speed vector is estimated by processing the signal information. A pre-amplifier then transmits this information in a digital format.

Impeller — These logs function by attaching an impeller or paddle wheel to the bottom of a hull. They are employed on small yachts and other such vessels.

GPS (Global Positioning System) — A sensor accesses the GPS satellite signals to pinpoint an object’s speed, in both longitudinal and transverse directions. GPS receivers with integrated rate gyros and an antenna unit calculate the heading velocity, attitude, and course. The heading is then compared in relation to the vessel’s magnitude and direction of motion in the water. The information delivered by the satellites is processed by the system, integrating the velocity data with the longitudinal and transverse ground speeds of the vessel. Speed vectors combined with data related to the rate-of-turn assist in differentiating between the vessel’s translational and rotational movement. These are required for estimating the transverse speeds for both bow and stern as given on the docking display.

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Source: globalspec.com

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Indonesia Marine Equipment

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