The NAVIGAT X MK 2 gyrocompass (fig. 4.13) is a compact, one-unit design that runs on a 24-volt power supply with two independent DC inputs. It can drive up to four analogue repeaters and provides five additional serial data outputs and one six-
steps/degree output. Based on the proven Sperry Marine NAVIGAT X MK 1 design, the new gyrocompass provides better than 40,000 hours mean time between failures. The system remains north-stabilized for up to three minutes in the event of a power interruption. The NAVIGAT X MK 2 complies with International Maritime Organization (IMO) regulations A.424(XI) and A.694(17) as well as the International Standards Organization (ISO) standard 8728, and is fully Wheelmark type approved.
The introduction of this new gyrocompass completes the Sperry Marine range of heading sensors, which now comprises the NAVIGAT 2100 fiber-optic gyrocompass, NAVIGAT X MK 1 and NAVIGAT X MK 2 digital gyrocompasses and the NAVISTAR satellite compass.
Main Features
• Comprises one single unit.
• Power supply: two independent 24 VDC inputs.
• Control and display in front cover (not removable) with 4-digit heading display and 6 operating keys
• Heading accuracy:
Static……………………< 0.1°secant latitude
Dynamic………………..< 0.4°secant latitude
Settle point error………..< 0.1°secant latitude
• Automatic static north speed error correction –no extra unit required.
• Rate-of-turn output.
• High speed transmission and follow-up system 100°/sec.
• Highly accurate heading data transmission by shaft encoder.
• Self-aligning repeater compasses with serial interface IEC-61162-1 / RS 422.
• Gyro system remains north-stabilized during power interruptions of up to three minutes.
• Twin rotors (19.000 rev./min.) and liquid damping system eliminates latitude error.
• ±180°electronic alignment error correction in setup program (mechanical correction notnecessary).
• High MTBF (40.000 hours).
• 18-month maintenance intervals
• Monitoring and alarm functions for all voltages, gyroscope current and follow-up system.
• Short maintenance and repair times – low service costs
• Permanent storage of operational data (gyrosphere current, temperature, elapsed operation time).
Outputs:
• 4 analogue repeaters (fig.4.14) (NMEA TTL): gyrocompass heading,
magnetic compass heading (when available), rate of turn, heading reference status, 4 x supply 24 VDC, max. 7 W each;
• 2 sensor data (RS 422):
gyrocompass heading, magnetic compass heading (when available), rate of turn, position (when available), speed (when available), heading, reference status;
• 1 RS 422 Fast IEC-61162-1 gyrocompass heading, magnetic compass heading (when available), rate of turn, heading reference status;
• 1 RS 422 SuperFast IEC-61162-1 or IEC-61162-2, selectable
gyrocompass heading, magnetic compass heading (when available), rate of turn, heading reference status;
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• 6 step/° output, current heading, supply 24 VDC, max. 18W;
• AD10 output, gyrocompass heading;
• Rate of turn, analogue ±0.1 - 999.9 mV/°/min.; max. 10 V, 10 mA;
• Furuno interface output, selectable;
• Alarm signal output (heading difference);
• Status signal output (power failure);
• NAVIPRINT navigation data printer, selectable through one of the available RS 422 interfaces.
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The optional configurations of the gyrocompass may include the Multifunction Digital Display NAVIDATA (fig. 4.15), Universal Digital Repeater (fig. 4.16), Compass Monitor NAVITWIN III and MAGNETIC Compass with fluxgate.
Inputs
• IEC-61162-1 position input
• IEC-61162-1 speed input or 200 p/nm
• Electronic compass input (IEC-61162-1)
• Mute function
• Status gyro/magnetic
• Steering mode status
Power Consumption
Startup DC 80 W
Operation DC 45W
Each repeater (analogue) 8 W
Dimensions of gyrocompass:
Width 404 mm, Height 520 mm, Depth 420 mm
Weight - 21 kg