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Walker 4020 Mk2


Walker 4020 Mk2  is MED Type Approved, it is a compact EM Speed Log for smaller vessels which require a “Wheelmarked” MED Type Approved system in a minimal package reducing the size and number of sub-units required. This results in a smaller, lighter system which is simpler to install.

The 4020 combines the electronics unit with the speed and distance indicator in one master unit which may be console or bracket mounted.

High reliability sensors, flush fitting, fixed and retractable types housed in hull fittings suitable for various hull materials, such as aluminium alloy, steel, GRP and wood



  • Full compatibility with most Walker flush fitting, fixed or retractable speed log sensors and hull fittings.

  • Digital Speed and Distance Run displays by red LED dimmable indicators.

  • Multipoint speed calibration as speeds from up to 60 knots.

  • Removable keypad “calibrator”.

  • Built-in Speed Simulator.

  • NMEA 0183/RS422 and 200 ppnm outputs to other ship systems.

  • Repeater indicators to DIN144 standard (optional).

  • Simple to install, operate and service.

  • EM Speed Log technology drawn from over 30 years’ experience.



Physicals & Performance

Mechanical Dimensions

Speed log sensor and hull fittings with sea valve: 387 (W) x 165 (D) x 578 (H) (Steel dimensions given)

Speed log sensor and hull fittings without sea valve: 152 (Ø) x 178 (H)

Electronic Unit with Master Speed and Distance indicator, console mounting: 330 (W) x 215 (H) x 180 (D)

Electronic Unit with Master Speed and Distance indicator, bracket mounting: 380 (W) x 265 (H) x 180 (D)

Keypad calibrator: 82 W x 110 (H) x 50 (D)

DIN 144 repeaters: 144 (W) x 144 (H) x 105 (D)


Sensor (fixed), supplied with 50 metre cable: 9.0 Kg (Steel) 9.0 Kg (Alloy)

Sensor (retractable), supplied with 50 metre cable: 9.75 Kg (Steel)

Hull Fittings for fixed sensor: 5.3 Kg (Steel) 1.8 Kg (Alloy)

Hull Fittings for retractable sensor, test witnessed by G.L.: 27 Kg (Steel)

Master Speed and Distance indicator: 4 Kg

Repeaters: 1.2 Kg

Power supply requirements

Voltage: Standard 24 v DC +10% -20% (20W)

With optional power supply: 110/220 v AC (30vA)
Voltage must be specified when ordering.

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