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The Sperry Marine NAVIKNOT Multisensor Speed Log Series (comprising models 350E, 450D, 600S, 600SE, and 600SD) is a modular, high-precision Speed and Distance Measuring Equipment (SDME) platform. Designed for all types and sizes of vessels—from commercial tankers and container ships to mega-yachts—it combines traditional electromagnetic and acoustic Doppler technologies with satellite-based GNSS tracking.
Utilizes an alternating magnetic field generated by an AC excitation coil in the hull-mounted sensor. As conductive seawater moves past the sensor, it creates an electrical potential directly proportional to ship speed through water.
Emits high-frequency ultrasonic sound pulses (fore and aft) into undisturbed water layers beyond the hull’s boundary layer. The frequency shift of the returned echoes is computed to determine precise fore/aft STW.
Employs a dual-antenna GNSS receiver array integrated with rate gyros to calculate heading, rate of turn, longitudinal SOG, and bow/stern transverse SOG for docking maneuvers.
| Model | Sensor Technology | Measurement Type | Primary Applications |
| NAVIKNOT 350E | Electromagnetic (EM) Sensor | Single-Axis Speed Through Water (STW) | Standard commercial vessels, retrofit solutions |
| NAVIKNOT 450D | Doppler Transducer | Single-Axis Speed Through Water (STW) | Vessels requiring non-contact acoustic STW sensing |
| NAVIKNOT 600S | Satellite Sensor (Dual-Antenna GPS/GNSS) | Dual-Axis Speed Over Ground (SOG) | Precision navigation & docking support |
| NAVIKNOT 600SE | Combined Satellite + Electromagnetic | Dual-Axis SOG + Single-Axis STW | IMO compliant dual-mode log for large vessels |
| NAVIKNOT 600SD | Combined Satellite + Doppler Transducer | Dual-Axis SOG + Single-Axis STW | High-specification dual-mode deep-sea vessels |
| Parameter | Specification |
| Speed Accuracy | ±1% or 0.1 knots, whichever is greater |
| EM Speed Range (STW) | -20 to +60 knots (depending on sensor type) |
| Doppler Speed Range (STW) | -50 to +50 knots |
| Satellite Speed Range (SOG) | -99 to +99 knots (Longitudinal and Transverse) |
| Distance Counter | Dual miles counter (Total counter and Daily resettable counter) |
| Display Unit (CDU) | Large color TFT screen with user-selectable display color themes |
| Supply Voltage | 24 V DC (nominal) |
| Damping Adjustment | Programmable damping filter from 0 to 99 seconds |
| Type Approval | Compliant with Marine Equipment Directive (MED) 96/98/EC / IEC 60945 |
| Protection Rating | IP 23 to IP 65 for CDU / IP 68 for submersible hull sensors |
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