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The SKIPPER EML 224 (and its single-axis variant, the EML 124) is a compact, IMO-wheelmarked electromagnetic speed log system designed to provide accurate Speed Through Water (STW) and sea water temperature readings for commercial vessels, merchant fleets, and fishing vessels.
Because it operates using electromagnetic induction, it has no moving parts, flush-mounts with the hull (protruding only a few millimeters), and functions reliably without a minimum depth requirement starting from 0 meters.
The hull-mounted sensor generates an electromagnetic field in the sea water immediately surrounding the hull. As the conductive sea water moves through this magnetic field, a small voltage potential is generated proportional to the ship’s speed. The signal electronics measure this voltage and calculate both longitudinal and transversal speeds.
SKIPPER EML 124: Single-Axis speed log (Longitudinal STW ahead/astern).
SKIPPER EML 224: Dual-Axis speed log (Longitudinal STW ahead/astern + Transversal STW port/starboard).
Zero Minimum Depth: Measures speed relative to water right at the surface of the hull (water track starts at 0 m).
Integrated Sea Temperature Monitoring: The sensor includes a built-in water temperature sensor.
Compact Display: 144 × 144 mm front-plate display with a 28 × 30 red LED dot-matrix array and full night dimming capability.
Retrofit Compatibility: Mounting options support replacing older systems (such as Simrad NL-log, Sagem/Safran, Naviknot SRD331, and PCSV60) using existing sea valves or tanks.
Maintenance-Free Transducer: Electromagnetic sensor has no moving mechanical parts, reducing marine fouling and wear.
| Parameter | Specification |
| Longitudinal Speed Range | ±40 knots |
| Transversal Speed Range | ±40 knots (EML 224 dual-axis only) |
| Speed Accuracy | Better than 0.2 knots or 1% |
| Temperature Sensor Accuracy | Error < 1°C |
| Display Unit | 144 × 144 mm (DIN size), 28 × 30 pixel Alphanumeric LED (Red) |
| Power Supply | 115 / 230 V AC (50/60 Hz) or 20–32 V DC (auto switch-over) |
| Power Consumption | Max 30 W |
| NMEA Outputs |
2× NMEA 0183 (IEC 61162-1) • Speed: VBW, VHW sentences • Distance: VLW sentence • Temperature: MTW sentence |
| Pulse Output | 1× contact closure (programmable log pulse output, e.g., 200 pulses/NM) |
| NMEA Inputs | 1× NMEA 0183 (Optocoupler isolated) |
| Auxiliary Contacts | 1× Alarm relay output, 1× System fitness relay |
| Type Approval / Classification | IMO Wheelmarked, MED-B, CCS, RMRS |
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