JRC GPS JNAV – 500
Japan Radio Co., Ltd. (JRC)
Refurbished
The JRC J-NAV500 is a marine GPS/DGPS Display and Navigation Unit manufactured by Japan Radio Co., Ltd. (JRC), Japan.
JRC's official archived brochure identifies the equipment specifically as the J-NAV 500 GPS/DGPS DISPLAY. It can be connected to a compatible GPS 112 GPS Sensor or DGPS 212 DGPS Sensor, providing vessel-position, course, speed, waypoint and navigation information on a compact LCD display.
The product supplied in the photograph appears to include a J-NAV500-style display together with an external dome-type GPS/DGPS sensor and connecting cable.
Manufacturer: Japan Radio Co., Ltd. (JRC)
Country of Origin: Japan
Exact Model: J-NAV500
Product Type: GPS / DGPS Display & Marine Navigator
Display: STN LCD, 128 × 100 dots
Compatible Sensors: GPS 112 and DGPS 212
Marine Application: Position display, waypoint navigation, route monitoring and vessel navigation
Status: Discontinued / Legacy JRC Product
JRC currently lists J-NAV500 in its discontinued marine GPS-display category.
The J-NAV500 is essentially the bridge display and navigator used with an external JRC GPS or DGPS sensor.
The system allows officers to view essential navigation data such as:
• Latitude and Longitude
• Bearing
• Course Over Ground
• Speed Over Ground
• Distance to Go
• Cross Track Error
• Time to Go
• Waypoint information
• GPS/DGPS signal status
The official JRC brochure states that the unit supports NAV, CDI, position and plotting screens, allowing the operator to select the most useful presentation for a particular navigation task.
• Marine GPS/DGPS navigation display
• Compatible with GPS 112 and DGPS 212 sensors
• Large LCD presentation
• Navigation Mode
• CDI Mode
• Position Mode
• Plot Mode
• Up to 20 stored routes
• Up to 499 waypoints
• Man Overboard (MOB) function
• Event-mark storage
• Waypoint arrival alarm
• Cross-track error alarm
• Anchor-watch alarm
• Multiple selectable speed/distance units
• NMEA 0183 data interface
• Built-in simulator
• Multi-language operation
• Splashproof marine construction
JRC's archived brochure confirms the 20-route and 499-waypoint capacity as well as the main graphical modes.
According to JRC's official documentation:
Display Type: STN LCD
Resolution: 128 × 100 dots
Visible Display Size: 79 × 61 mm
Backlight: EL for LCD and LED for keyboard
Dimmer: High / Low via keyboard
Geodetic Datums: 46
Waypoints: 499
Event Marks: 499 maximum including waypoints
Route Plans: 20 routes, up to 200 waypoints maximum
Plot Scale: 1/8 NM to 100 NM
Speed Units: NM/KT, SM/MPH, KM/KPH
Power Requirement: 10.8–16 VDC
Power Consumption: Less than 4 W without GPS receiver
Weight: Approx. 0.9 kg
Water Protection: IPX5
JRC's official brochure also gives overall display-unit dimensions of approximately 197 mm wide × 138 mm high × 124 mm deep.
The JRC GPS 112 can be connected to the J-NAV500 to provide GPS position information.
JRC documentation for the GPS 112 identifies the receiver unit as JLR-4330E. It uses a 12-channel all-in-view GPS receiver, receives the GPS L1 C/A-code signal at 1575.42 MHz, and normally updates position once per second.
Important GPS 112 characteristics include:
• 12-channel parallel reception
• Typical cold-start fix around 45 seconds
• Typical warm-start fix around 30 seconds
• NMEA 0183 output
• DGPS correction input capability
• 10.8–16 VDC input
• 15 m data cable as documented configuration
The JRC DGPS 212, receiver type JLR-4331E, combines GPS reception with an internal differential beacon receiver.
JRC specifies:
• 12-channel GPS reception
• Internal differential beacon receiver
• Normally 1-second position update
• NMEA 0183 output
• PPS precise-clock output
• DGPS corrected accuracy stated as approximately 5 m RMS under the documented conditions
• Beacon reception from 283.5 to 325 kHz.
For an older vessel already fitted with a J-NAV500, sourcing the correct GPS or DGPS sensor can therefore be just as important as sourcing the display itself.
Presents key information needed when navigating toward a selected waypoint, including bearing, course, distance and speed.
The Course Deviation Indicator display helps the navigator monitor cross-track deviation relative to the planned course.
Provides direct latitude and longitude position information.
Allows waypoint and vessel-position information to be presented graphically.
The official JRC brochure specifically lists NAV, CDI, position and plotting screens.
The J-NAV500 can store:
499 waypoints
20 route plans
Waypoints can be scrolled and sorted, and the unit supports route-based navigation between stored positions.
This makes the system useful as a compact standalone navigation aid on vessels using legacy JRC bridge equipment.
The J-NAV500 provides NMEA 0183 communication for integration with compatible marine electronics.
The official brochure lists output sentences including:
GLL, VTG, APB, BWC, GGA, RMC and RMB
with NMEA 0183 Version 1.5 / 2.1 selectable.
Compatible navigation data can therefore be shared with other shipboard systems according to installation requirements.
The JRC J-NAV500 can be used aboard:
• Cargo Ships
• Bulk Carriers
• Tankers
• Container Ships
• Fishing Vessels
• Offshore Vessels
• Workboats
• Merchant Ships
• Smaller commercial craft
Typical applications include:
• Vessel position monitoring
• Waypoint navigation
• Route planning
• Cross-track monitoring
• Speed and course display
• GPS/DGPS data distribution
Inspect the external GPS 112 / JLR-4330E sensor, sensor cable, power and J-NAV500 data-input connection.
Check the DGPS 212 / JLR-4331E, beacon reception, antenna condition and data interface.
Inspect the antenna/sensor position and cable. Physical obstruction, sensor damage or cable faults can prevent reliable reception.
Check 10.8–16 VDC supply, fuse/protection, connector and internal power circuit.
Check dimmer/backlight settings first. Older LCD or backlight components may deteriorate with age.
Inspect NMEA 0183 wiring, output settings, polarity and receiving-equipment configuration.
The J-NAV500 supports waypoint arrival and cross-track error alarms. Confirm route and alarm settings before assuming hardware failure.
Inspect the front control assembly, PCB connections and internal switch/encoder components.
The official JRC specifications identify:
• Waypoint Arrival Alarm
• Cross Track Error Alarm
• Anchor Watch Alarm
• DGPS Alarm
Exact alarm behavior should be checked against the applicable operating manual and installation configuration.
• Inspect the GPS/DGPS sensor housing regularly.
• Check antenna/sensor cable condition.
• Inspect connectors for corrosion.
• Compare GPS position against another valid source.
• Check NMEA outputs periodically.
• Back up important waypoint and route information where possible.
• Keep the LCD and keypad clean.
• Investigate intermittent satellite reception before complete failure.
• Confirm correct sensor type before replacement.
SM MARINE SERVICE™ can support sourcing of JRC J-NAV500 complete systems and related GPS/DGPS components, depending on stock availability.
Typical requirements include:
• Complete J-NAV500 Display
• J-NAV500 LCD
• Display PCB / Main Board
• Keypad / Push Buttons
• Rotary Control / Encoder
• Power Supply Components
• Mounting Bracket
• Power / Data Cable
• Connectors
• GPS 112 Sensor
• JLR-4330E GPS Receiver
• DGPS 212 Sensor
• JLR-4331E DGPS Receiver
• CFQ-8773 Extension Cable
• Internal Electronic Components
Available condition may include:
New • Used • Tested Working • Refurbished • Reconditioned
Because JRC lists J-NAV500 as discontinued, good legacy replacement equipment can be especially useful for vessels maintaining existing installations.
The J-NAV500 is a legacy GPS display, so customers should not assume that a modern JRC GPS display will be a direct plug-and-play replacement.
Before upgrading, verify:
• Existing GPS/DGPS sensor
• NMEA format
• Supply voltage
• Sensor cable
• Mounting arrangement
• Connected radar/ECDIS/AIS equipment
• Required waypoint/navigation functions
JRC still publishes configuration guidance that references J-NAV500 / NWZ-4551 when discussing sensor setting procedures, showing that the equipment remains relevant in legacy support situations.
Many vessels retain older GPS navigation displays because the sensor, cabling, mounting bracket and bridge interfaces are already installed and functional.
When only the display, sensor or PCB fails, sourcing an exact compatible replacement can be simpler and more economical than redesigning the entire GPS navigation arrangement.
The J-NAV500 also remains a straightforward navigator with route, waypoint, CDI, MOB and NMEA functionality.
The J-NAV500 is a GPS/DGPS navigation display manufactured by Japan Radio Co., Ltd. for marine navigation.
JRC's official documentation uses J-NAV 500 / J-NAV500. This is the preferred model naming for technical and SEO purposes.
JRC documentation identifies the GPS 112 as an optional compatible GPS sensor.
JRC identifies it as JLR-4330E.
Yes. It can connect to the DGPS 212, identified by JRC as receiver type JLR-4331E.
The official brochure specifies 499 waypoints.
The J-NAV500 supports 20 route plans.
Yes. JRC documents NMEA 0183 Version 1.5 / 2.1 selectable output.
Yes. JRC currently lists the J-NAV500 under discontinued marine GPS display products.
SM MARINE SERVICE™ can support sourcing of complete J-NAV500 displays, GPS/DGPS sensors and related replacement parts, subject to availability.
Yes. Worldwide sourcing and shipping can be arranged according to stock availability and destination.
JRC J-NAV500 GPS/DGPS Display is a compact marine navigation display supporting position, CDI, plotting, waypoint and route-navigation functions. It can be connected to the JRC GPS 112 / JLR-4330E GPS sensor or DGPS 212 / JLR-4331E DGPS sensor. SM MARINE SERVICE™ can support worldwide supply of complete J-NAV500 equipment and spare parts in used, tested, refurbished and reconditioned condition.
JRC's official archived documentation provides J-NAV500 specifications, system diagram, display modes, waypoint capacity, electrical requirements and compatible GPS/DGPS sensors.
Download JRC J-NAV500 Official PDF
Official JRC documentation for the GPS 112 / JLR-4330E contains receiver specifications, NMEA output and system configuration.
Download JRC GPS 112 Official PDF
Official documentation for the DGPS 212 / JLR-4331E covers GPS/DGPS specifications, beacon receiver, NMEA output and PPS functions.
Download JRC DGPS 212 Official PDF
Marine Automation & Navigation Equipment Supplier
Available Condition:
• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment
Stock Location:
• Bangladesh • China
Services:
• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing
Contact Information
SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com
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