A high-accuracy Log complying with the requirements of IMO.
Many signal output functions as standard and Easy installation.

The TD-310 Doppler Speed Log is designed in accordance with the requirements of IMO regulation and has high accuracy, many signals’ output functions such as ship’s speed and distance etc..
The size of units are reduced as small as possible (the display unit particularly is 1/14 in volume and 1/5 in mass compared to TD-501), and easy to install to ships such as coastal ships and ocean going ships.


The TD-310 adopts the paired-beam system in which the sonic energy is directed ahead and astern.This virtually minimizes doppler shift errors caused by the ship’s motions. Furthermore, by receiving the echoes selectively from about 3 m below the ship’s hull, the TD-310 minimizes adverse wake influences.

By virtue of its non-protruding, flush-mount design, the transducer of the TD-310 is completely free from the damage caused by drift ice or wood. Moreover, it need not be retracted before entering a port or extended after leaving it.

Total cumulative distance(DISTANCE 1) and distance since reset(DISTANCE 2) are memorized for each display unit.

Up to 3 Display units and 4 Analog meters can be connected.

Auxiliary output signals as standard

  • Digital interface (IEC-61162-1 VBW,VLW) :8 circuits
  • 200 pulses/mile contact signals:8 circuits
  • Current signal (4-20 mA):1 circuit
  • Voltage signal:1 circuit

Low cost and simplicity of installation

  • All special cables are supplied by TOKYO KEIKI.
  • Size of main units are reduced and as a result, system can be installed with ease and low cost.
    Especially, the depth of the display unit is reduced to about 30 mm.


Operating methodUltrasonic paired-beam pulsed doppler systemOperating frequency2MHzSpeed range-10 knots to 30 knotsSpeed display3-digits numerical LED readoutAhead/Astern indicationAhead : green LED indicationAstern:red LED indicationDistance display0.0 to 9999.9 nautical miles in LEDDistance 1 and distance 2 can be stored in non-volatile memory for each display unitAccuracy+/- 0.1 knot(speed) +/- 1%(distance)Speed data outputIEC-61162-1 VBW sentence (8 circuits)output period is variable between 0.5 and 9.9 sec.Current signal (1 circuit)4 mA = – 5 knots, 20mA=+25 knotsVoltage signal (1 circuit)-3.2 V = -10 knots, 9.6 V =+30 knotsDistance data outputIEC-61162-1 VLW sentence(8 circuits)output period is variable between 0.5 and 9.9 sec.200 pulses/mile contact signals (8 circuits)pulse width = 100ms (75ms-125ms)Operating depth3m(2m-5m variable)Power supplyAC 100/110/115/220 V 50/60 HzPower consumptionLess than 50 VAOperating temperature-15 – 55 (Celsius)OthersSelf check function, Analog meter connection, Sea water temperature automatic correction, Transducer mounting error correction

We are a family owned and operated business with over 100 years of experience

Please feel free to contact to discuss your requirements in more detail, we would be delighted to assist you.

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