Marine Radar Systems: Furuno, JRC, Koden & Sperry Model Guide

Radar remains the single most relied-upon piece of equipment on a vessel's bridge. It works day or night, in fog or clear skies, and gives the watch officer a real-time picture of everything moving around the ship — long before it's visible to the eye. Choosing the right radar system, however, isn't just about picking a screen size. It comes down to a handful of specifications that decide how well the unit performs when it matters most. At Nautical Marine Services, whoever has a requirement can reach out to us and we'll help match the right radar system — Furuno, JRC, Koden or Sperry Marine — to their vessel and operating route.

X-Band vs S-Band: Picking the Right Frequency

Most merchant vessels carry both, and each serves a different purpose. X-Band radar (around 9 GHz) gives sharper image detail and better target discrimination, which makes it the go-to choice for close-range navigation, coastal work and picking out small craft. S-Band radar (around 3 GHz) has a longer wavelength that cuts through heavy rain and sea clutter far better, making it the stronger option in poor weather and open-ocean conditions.

• X-Band: sharper resolution, ideal for harbour approach, narrow channels and small-target detection.
• S-Band: better rain and clutter penetration, ideal for long-range and heavy-weather passages.

Larger vessels and offshore platforms typically run both side by side, switching between them depending on conditions rather than relying on one alone.

Range and Antenna Length

Antenna length has a direct effect on bearing resolution — a longer antenna produces a narrower beam and separates close targets more clearly. Range requirements depend heavily on the vessel's operating area: a coastal supply vessel doesn't need the same maximum range as a tanker running open-ocean routes. Match the antenna and transceiver power to the actual voyage profile rather than defaulting to the highest spec available.

ARPA and Target Tracking

Automatic Radar Plotting Aid (ARPA) functionality tracks multiple targets simultaneously and calculates their course, speed and closest point of approach. On vessels with a high traffic density in their operating routes, ARPA capacity — how many targets the unit can track at once — becomes just as important as raw range performance.

Integration With Other Bridge Systems

Modern radar units rarely work in isolation. They typically feed into ECDIS as an overlay and share data with AIS for target correlation. Before selecting a unit, confirm it supports the same data protocols and connector types as the rest of the bridge equipment — a mismatch here is one of the most common causes of costly rework during installation.

Maintenance and Uptime

Magnetron-based radar transceivers have a finite service life and eventually need replacement — this is expected and should be budgeted for, not treated as a fault. Solid-state transceivers cost more upfront but avoid the periodic magnetron swap entirely, which is worth weighing for vessels where downtime is expensive.

Radar Brands & Model Numbers We Work With

Most vessels we support are already running one of a handful of established radar brands. Below is a full reference on the model numbers you're likely to come across — Furuno, JRC, Koden and Sperry Marine — along with what each is generally used for. Nautical Marine Services supplies units across all of these brands on an order basis — see our full marine radar systems range.

Furuno Marine Radar Models

Furuno is the most widely fitted radar brand on merchant tonnage. Below are the Furuno radar model numbers we most commonly supply, from the compact Furuno FAR-1518 to the solid-state Furuno FAR-3000 series.

Looking to buy or replace a Furuno radar unit? Contact us with your model number — we confirm current price and lead time before you order.

JRC (Japan Radio Co.) Marine Radar Models

JRC radar units, from the flagship JRC JMR-9200 series to the older JRC JMA-5300MK2 still fitted on much existing tonnage, are supplied to order — get in touch to check current availability for your model.

Looking to buy or replace a JRC radar unit? Send us the model number from your nameplate — we confirm current specification, price and availability before you order.

Koden Marine Radar Models

Koden's mid-size commercial radar line, including the Koden MDC-2000 and Koden MDC-5200, remains popular for its AIS interface support and true trail function.

Looking to buy or replace a Koden radar unit? Send us your model number and we'll confirm specification, price and availability before you order.

Sperry Marine Radar Series

Unlike Furuno, JRC or Koden, Sperry's radar systems are usually identified by product series and configuration (antenna size, transceiver power, workstation type) rather than a single model number. The series names below are the ones most commonly referenced by ship staff and in spares requests — including the Sperry BridgeMaster E and Sperry VisionMaster FT series.

Scanner control units from the 65837 series and display/processor units from the 65920 series are what typically appear on a Sperry nameplate or in a spares request.

Frequently Asked Questions – Marine Radar Models

Quick Checklist Before You Order

• Confirm frequency band(s) needed for the operating area
• Match antenna length and range to actual voyage profile
• Check ARPA target-tracking capacity against typical traffic density
• Verify data protocol compatibility with existing ECDIS/AIS setup
• Decide between magnetron and solid-state transceiver based on maintenance budget

Once you've confirmed your specification, Nautical Marine Services can check availability from our marine radar range and arrange delivery to your vessel's next port of call.