Speed Log · Position & Heading
It is normally installed on the bridge, mast or sensor deck, with repeaters and interfaces distributed to navigation systems. Its primary duty is to determine vessel position, heading or speed and provide this information to bridge and control systems. In service it interfaces with GNSS antennas, gyro/speed sensors, repeaters, radar, ECDIS, AIS, autopilot and navigation networks. Compared with neighboring entries in the same product family, this record is the exact Sperry Marine Naviknot Speed Log 400 variant; the model designation should be quoted exactly when matching onboard documentation and spares. For exact limits, settings, test values and approved maintenance criteria, refer to the manufacturer documentation for the exact figure.
Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.
What our service work and the manufacturer documentation say about keeping this model running.
Check sensor health, antenna/mounting condition, power, interfaces, alarms and comparison with independent references; calibration/alignment should follow approved procedures and manufacturer data.
Carry critical power supplies, interface converters, antenna/cable components, display controls and sensor-specific service spares.
Free of charge — send us your request for Sperry Marine equipment. Our team checks it and replies by e-mail.
Other models of the same equipment type, Sperry Marine first.
Tell us what you need for this Sperry Marine Naviknot Speed Log 400 — a part, a service call, a second opinion. Are you Sperry Marine? Claim this brand page.
Service engineer? Write the day report for this Naviknot Speed Log 400 in OceanSphere Work — photos, hours and parts, as a PDF for the owner. Try it free for 14 days →
Yes. Specifications, documents and service notes for this model are readable without an account. An account adds saved searches and requests, nothing is taken away.
Yes. Tell us the manufacturer, the model and what you need — a person reads every request and replies by e-mail.
Send us the nameplate or the correct value. We check it against the manufacturer datasheet or class-society record and update the page.