Transmitting Heading Device

Furuno SC-50

  • Provides highly accurate heading data for autopilot, radar, AIS, Sonar and plotting systems
  • IMO MSC.116(73) type approved as a verified THD (Transmitting Heading Device)
  • Rapid 45°/s follow-up rate greatly exceeds IMO High Speed Craft requirements 20°/s
  • High accurate GPS, WAAS Data – SOG, COG, ROT, and L/L
  • Precision Pitch/Roll Data in Analog and Digital formats for vessel stabilizers, sonar, etc..
  • Multiple High Speed Heading Data Output in IEC 61162-1/2 (NMEA0183/HS)
  • High Contrast 4.5″ Silver Bright LCD
  • 100% free of yearly or regular maintenance – No Recurring Costs
  • Unique Tri-Antenna System improves system accuracy and reduces the effects of yaw, pitch and roll

The SC-50 is a new satellite compass that uses Furuno’s advanced GPS technology. This satellite compass can be used for a wide range of applications for any type of vessel. Radar/ARPA, AIS, ECDIS, Scanning Sonar and Autopilots can utilize the functions of this compass. The SC-50 uses GPS carrier frequency to determine heading and is not affected by ship’s speed, latitude, geomagnetism, etc. Settling time is nearly instantaneous and the follow-up performance is excellent, achieving 45°/s (SOLAS HSC Code requires 20°/s as a minimum).

The SC-50 delivers GPS positioning, SOG (Speed Over Ground), COG (Course Over Ground) and ROT (Rate of Turn). SOG is remarkably accurate through decoding the Doppler shift in the received satellite signals. The information can be output in IEC61162-2 format at the high update rate up to 38.4 kbps to satisfy the high speed data-output requirements in special applications.

The SC-50 has a unique Set and Drift mode. When connected with a water-tracking speed log, it calculates set and drift (tide direction and speed) in the mode. The display helps a radar operator manually enter set and drift for the accurate sea stabilization pictures.


Receiver type: 12 discrete channels
C/A code, all-in-view
Frequency: L1 (1575.42 MHz)
Heading accuracy: ±1.0° (95% static accuracy)
(IMO THD MSC.116(73) static accuracy: ±1.0° × secant Lat.)
GPS accuracy:
10 m (95%)
5 m (95%)
3 m (95%)
Tracking rate of turn: 45°/sec
Settling time: 3 min
Display Unit: Monochrome LCD, 4.5″ 120 × 64 pixels
Display Mode: Steering, Nav Data, Compass Rose, ROT, Heading and Set and Drift modes
Ambient condition: IEC 60945 for EMC, Vibration, Temperature
Number of ports: 5 ports in AD-10 or 10 ports in IEC 61162-1/-2
1 port AD-10 only
Serial data sentence (25, 100, 200 ms, 1, 2 s data rate): HDT, HDM(Heading), ROT(Rate of turn), ATT(Pitch and Roll)
Serial data sentence (1, 2 s data rate): VHW(Heading), VTG, VBW(SOG), GGA, GLL, GNS(L/L), ZDA(UTC), VDR( Set and Drift)
LOG pulse: 1 port (200 or 400 p/nm)
Alarm Output: Alarm signal (closure signal)
Heading Input: Backup Heading (AD-10/IEC 61162-1) HDT, HDG, HDM, VBW, VHW, VLW
DGPS Input: RTCM SC-104 format
Power supply: 12-24 VDC, 15 W
Power consumption: 12W (sensor and display unit)
Processor Unit
Antenna Unit
175 × 125 × 78 mm
350 × 210 × 68 mm
Ø 650 × 150 mm
Processor Unit
Antenna Unit
1.2 kg
9.3 kg
9.3 kg
Display Unit SC-502
Antenna Unit SC-303 with 15 m cable
Processor Unit SC-501
Antenna Cable 30 m CP20-01700,
50 m CP20-01710
Flush Mount Kit S type CP20-17,
F type CP20-29




The JLR-21/31 GPS compass continues the success of its predecessor, reaching a new level of performance and stability with many new features and enhancements. This system is also known as a 3D Dynamic Sensor, which besides giving heading information, is designed to provide highly accurate information of the ships movement in all axis.

The JLR-21/31 has heave functionality built-in as standard. In rough ocean conditions (with high waves), the GPS compass can correct up and down (attitude), movement. This is especially useful for fish finders and sonars on fishing vessels where high waves are compensated for with up to 20 cm accuracy, providing better potential for a profitable catch.

JLR-21/31 supports Speed Over Ground (SOG) and Course Over Ground (COG). The position, SOG and COG are updated every 200 milliseconds (which is 5 times faster than previous model JLR-20), delivering high accuracy.

The GPS compass has its origins as a direction sensing system, but the JLR-21/31 goes far beyond that. The JLR-21 provides heading accuracy of 0.5° and the JLR-31 has an impressive 0.25° heading accuracy. Heave accuracy is 20 cm or better and roll and pitch for both models is 0.5°. The tracking Rate of Turn (ROT) is 45° per second.

The JLR-21/31 incorporates many display modes readily available on a highly visible 5.7 inch LCD display. The display is fully dimmable and the keys are also backlit, making it easy to operate in low-light settings on the bridge.

The processor is built into the antenna. Eliminating alignment between antenna and processor found in separate systems, therefore contributing to an easy setup with less error and significantly reduced installation time. This concept also reduces the installation costs as only a single cable is used between antenna and display unit. The system has a short start-up time (less than 2 minutes). Maintenance is not required, making it less expensive to maintain than a standard gyro system.

The GPS compass allows calculation of distance and bearing between any two points, supporting Rhumb Lines (RL) for the short legs and Great Circle (GC) for long distance legs. Also, a trip log function comes standard for distance and heading.

The JLR-21/31 has CCRP function incorporated, allowing the transfer of CCRP sentences to other onboard equipment and anchor watch alerts the watch officer of possible anchor dragging situations.

The new trend graph display mode shows a history of roll, pitch and heave and SOG as an easy-to-read graphical view. Selections can be made to show maximum or average results.

The new GPS compass integrates 5 independent working NMEA output ports, which allows for connection to a wide range of onboard navigation equipment, such as radar, plotter, autopilot, sonar or other navigation devices.


Receiver type: Multi channel all-in-view (12ch 1ch SBAS)
Frequency: 1575.42MHz ±1MHz (C/A code)
Direction accuracy:
0.5° rms
0.25° rms
Display resolution: 0.1°
Output resolution: 0.1° or 0.01° (selectable)
Tracking rate of turn: 45°/sec
Tracking acceleration: 1G
Settling time: ≤2min (warm start fix)
DGPS input: RTCM SC-104 ver2.0 type 1,2,9,16
SBAS receiver: built in (WAAS, EGNOS, MSAS)
Roll/pitch output: -60° to 60°
Position accuracy: 12m 2drms (C/A code, HDOP=<4, SA OFF)
6m 2drms when SBAS corrected
4m 2drms when DGPS corrected (when connected to beacon receiver)
Waterproof: IEC60945 ed.4 (IPX6/USCG CFR-46)
Ambient condition:
operating temperature
storage temperature
-25°C +55°C
-25°C +70°C
Display unit: 5.7” FSTN LCD 320×240 dot
Display modes: Compass rose, bow heading, navigation, rate of turn (ROT), water/ground speed, trend graph, calculation, GPS status
Output: 5 independent working NMEA0183 ports (ver. 1.5, 2.1, 2.3)
AD10 output available: 2 of 5 ports
Transmission speed: 4800, 9600, 19200, 38400, 57600 bps
Output interval: 20ms, 25ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 3s, 4s, 5s, 6s, 7s, 8s, 9s
Current data input: 1 port (CUR, VBW)
Alarm contact signal: alarm output × 2 ports
alarm ACK input × 1 port
LOG pulse: 1 port (off, 200p/nm, 400p/nm)
Waterproof: IPX4
Ambient condition:
operating temperature
storage temperature
-15°C +55°C
-15°C +70°C
Power supply: DC 12/24V +30% -10%
Power consumption: 12W (sensor and display unit)
6 W (excluding sensor)
Vibration/EMC: IEC60945 ed.4
NNN-20 sensor
NNN-30 sensor
142 × 230 × 85 mm
561 × 621 × 285 mm
913 × 1027 × 286 mm
NNN-21 sensor
NNN-31 sensor
2.3 kg
5.9 kg
10 kg
Display NWZ-4701
Sensor (built in processor unit) NNN-21 (JLR-21) or NNN-31 (JLR-31)
Power cable display 2 m
Serial data cable CFQ-5374, 3 m
Display to antenna 10 m
AC power rectifier NBG-320
Dry contact signal cable CFQ-5404 (3m)
Data extension cable CFQ-7249 (20m)
Beacon extension cable CFQ-7250 (3 m data, 0,4 m pwr)
Flush mount kit MPBC43664
Junction box NQE-7720
DGPS receiver JLR-4341
Anti-bird kit MPXP34012A
Y cable for sub display CFQ-7251
Data cable CFQ-5469 (for JMA-5100/5200/5300)