Electromagnetic log measures ship’s speed and indicates distance traveled.
nThe electromagnetic log measures speed through water (STW) from the flow of water at the bottom of the ship and calculates the total distance of navigation.
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nThe main functions
na) Mileage and speed calculation analysis and output.
nb) Alarms for power failure, system abnormality and speed overrun; and
nc) Satellite ephemeris status and distribution display
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nWith its advanced electromagnetic technology, the Electromagnetic LOG is highly resilient to interferences caused by external factors such as weather conditions or water turbulence. This ensures reliable and consistent measurement results, even under challenging navigational conditions.
nDesigned to meet the strictest industry standards, the Electromagnetic LOG is a durable and long-lasting device with minimal maintenance requirements. Its rugged construction and waterproof design keep it protected from damage caused by harsh marine environments.
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nProduct Feature
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n● 7.0-inch color touch screen display unit, providing the speed to water (STW) and travel distance information, more intuitive data, more convenient equipment.
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n● NMEA 0183 interface to ship systems.
n● Ease of installation, use and service.
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n● Optional 4.2-inch or 7.0-inch color display repeater.
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nInterconnection Diagram
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nFAQ of the EML9000 Electromagnetic Log
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(1) How does your self-developed electromagnetic log work, and what makes it different from ordinary models?

nOur electromagnetic log works on Faraday’s Law of Induction, but with our self-developed core technology. A coil generates a magnetic field perpendicular to water flow; seawater induces an EMF, detected by built-in electrodes to calculate ship speed. Our unique independently designed signal processing chip reduces interference from water conditions and hull effects, ensuring stability.
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(2)Can this electromagnetic log work in both saltwater and freshwater? I’ve used other models that fail in freshwater.

nYes, it works stably in both saltwater and freshwater. Traditional logs fail in freshwater due to low conductivity, but our product uses modified electrodes and enhanced signal amplification. Its self-calibration system adjusts automatically to water conductivity. A quick 2-3 minute manual check is recommended when switching between water types for optimal performance.
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(3)How difficult is the installation, and do we need professional technicians to set it up?

nInstallation is user-friendly-no professional technicians are needed, as most customers finish it with their on-board team. It comes with a detailed diagrammed guide and all necessary accessories. Mount the sensor in a stable water flow area with reliable grounding. Our technical team offers 24/7 remote guidance if you encounter issues.
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n(4) Can the log connect to our existing ship navigation system, and what data output formats does it support?
nYes, it’s compatible with mainstream navigation systems (GPS, AIS, ECDIS) and supports NMEA 0183 output formats for easy integration. Our team also provides custom integration solutions for special system requirements.
n(5)What should we do if the log shows abnormal data (e.g., no signal, fluctuating readings)?
nMost abnormal data comes from external factors. Troubleshooting steps: ① Check sensor submersion; ② Inspect cables and waterproof joints; ③ Verify grounding; ④ Clean sensor electrodes. If unresolved, use the built-in self-diagnostic error code and contact our team for solutions within 24 hours.
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n(6)Is your electromagnetic log customizable for specific ship types or special navigation needs?
nYes, we offer custom solutions since we independently develop and produce the log. We can adjust specifications for any ship type (cargo, yacht, research vessel) and meet special needs (deeper sensors, custom output, unique integration). Standard customizations have no extra lead time-just share your requirements with our R&D team.
n(7)What kind of after-sales support do you provide for overseas customers?
nWe provide comprehensive global after-sales support: 1-year global warranty, 24/7 technical guidance (email, phone, video), regional spare parts warehouses for fast delivery, and free online team training. We ensure a smooth experience from purchase to long-term use.
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nAccessories List: What does it include?
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• Display Unit EML9007

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• Data Unit EML900J

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• Sensor Unit A-TE571S1

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• Sensor Connection Cable

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• Display Unit Bracket

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• 9-core Data Cable(5m)

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• Installation dimension diagram

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• Operation Manua

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• Certificate of conformity

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• CCS certificate

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• M4*20 flat round head self-tapping screws

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• M10* 20 Hexagon socket flat machine screw

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• M6* 20 External Hexagon Flat Machine Screw

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• Ear Nut

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• Fuse

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• RV Round tube pre-insulated cold-pressed terminal

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• Black nylon cable tie 100mm

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• 3.81mm wire clamp

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• Gate Valve

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nProduct Parameter(Specification)
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n(1). Basic Performance Parameters
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n(2). Display Unit
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n(3). Interface
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n(4). Power Supply
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n(5). Operating Environment
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