Electromagnetic Speed Logs - Navigation and Communication
An electromagnetic speed log measures a vessel’s speed through water using the voltage induced by seawater moving through a magnetic field. It supplies speed and distance data to navigation systems, radar, autopilots, voyage data systems, and engine monitoring equipment.
ProShipWorks provides end-to-end support to source and supply Electromagnetic Speed Logs for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.
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Product Information
| Product Name | Electromagnetic Speed Logs |
|---|---|
| Product Category | Navigation and Communication |
| Product Reference | 718 |
| Brands / Manufacturers | Furuno, JRC, Skipper Electronics |
| Unit of Measure | Piece |
Key Features
| Key Feature |
|---|
| 1. Measures speed relative to the surrounding water |
| 2. Uses electromagnetic induction and a hull-mounted sensor |
| 3. Provides longitudinal speed and accumulated distance |
| 4. Supports analog, serial, and marine navigation data outputs |
| 5. Suitable for integration with bridge navigation equipment |
Applications of Electromagnetic Speed Logs
| Application |
|---|
| 1. Merchant ships and tankers |
| 2. Naval, offshore, and research vessels |
| 3. Speed input for radar, ECDIS, autopilot, and voyage data systems |
Technical Specifications
| Model | Specification | Value | Unit |
|---|---|---|---|
| Typical marine electromagnetic speed log | Measurement principle | Electromagnetic induction | — |
| Typical marine electromagnetic speed log | Measured speed | Speed through water | — |
| Typical marine electromagnetic speed log | Sensor installation | Flush or retractable hull-mounted sensor | — |
| Typical marine electromagnetic speed log | Data output | NMEA 0183 and/or analogue pulse output, depending on equipment | — |
Standards, Certifications & Class Approval
Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.
| Applicable Standards & Certification | Marine speed and distance measuring equipment may be designed and type-approved to IMO MSC.96(72) and IEC 61023. Bridge equipment commonly also follows IEC 60945 environmental and EMC requirements. Exact compliance depends on the manufacturer and product type. |
|---|---|
| Class Approval | Depending on the product and installation, approval may be available from DNV, ABS, Lloyd's Register, Bureau Veritas, ClassNK, or other recognized classification societies. Approval must be verified for the specific model and vessel application. |
Installation, Maintenance & Safety Information
| Installation Notes | Install the sensor at a manufacturer-approved hull location with adequate clearance from seawater turbulence, appendages, and magnetic or electrical interference. Follow the vessel's approved drawings, cable shielding requirements, grounding instructions, and calibration procedure. |
|---|---|
| Maintenance Tips | Inspect the hull sensor, cable, junctions, and display or processor during scheduled maintenance. Remove marine growth from the sensor area during dry-docking and verify zero-speed indication, output signals, and calibration against a reliable navigation reference. |
| Safety Notes | Follow vessel electrical isolation and permit-to-work procedures before servicing. Hull penetrations and retractable assemblies must remain watertight and correctly secured. Do not remove or service an underwater sensor while afloat unless the equipment and procedure are specifically approved for that operation. |
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