Description
DEVICE: GYROCOMPASS
BRAND: SPERRY MARINE / C-PLATH
TYPE: NAVIGAT X MK1
ABOUT SPERRY MARINE NAVIGAT X MK1 GYROCOMPASS
DESCRIPTION
Design and Main Features
NAVIGAT X Mk 1 / SR-180 Mk 1 is a microprocessor controlled gyrocompass system
with integrated automatic north speed error correction.
The system is type approved by the German Federal Maritime and Hydrographic
Agency (BSH) and complies with IMO resolutions A.424 (IX) and A.574 (14) as well
as DNV-W1 and ISO standard 8728.
For use in high speed craft, an optimized system is available, which complies with
IMO resolution A.821 (19) – HSC.
C. PLATH’s unique method of supporting the gyrosphere by means of mere buoy-
ancy ensures north stabilization during short power failures. For example, after a
three minute loss of power, no more than two degrees of deviation may be expected.
Once power has been restored, the gyrocompass will return quickly to the correct
heading without requiring the usual settling period. The combined effects of the twin
rotors an the liquid damping system virtually eliminate latitude error.
Heading is measured as a 12 bit absolute value by means of a digital shaft encoder.
The high-speed follow-up system (> 100°/sec.) ensures extremely accurate meas-
urements of heading and rate of turn under all operating conditions.
The system features an integrated TMC-function (magnetic compass transmission)
and input interfaces for a second gyrocompass, speed log, position receiver and two
rudder angle feedback units.
The gyrocompass provides 12 independent serial data outputs to analogue or digital
repeaters (including short-circuit-proof 24 VDC repeater power supply), RS 422 and
NMEA sensor data outputs, a special NMEA Fast output interface (reduced dataset)
and a NMEA Superfast output interface (adjustable baudrate, max 38400 baud). Fur-
thermore, two 6 step/0 heading outputs, an analogue rate of turn output and an inter-
face for the voyage data printer NAVIPRINT are provided.
Integrated monitoring and alarm functions for the supply powers, gyroscope temperatur
and current and the follow-up system ensure secure and trouble-free operation of the
system.
The single unit design with a polyurethane hard foam housing of low weight allows
the gyrocompass system to be installed on any bridge, from large yachts to the most
capacious merchant vessels. If required, the integrated control and display unit may
be installed at a remote location from the gyrocompass or an additional remote oper-
ating unit installed.
As an option, a special “compass monitor” control unit is available, which provides
additional independent monitoring functions and features a numerical keypad, which
facilitates the operation of the system.
An optional switch-over unit for twin gyrocompass systems provides for complete
redundancy of all in- and output signals and thus ensures the independence of the
individual compasses.
Technical Data
heading display ………………………………………. 4-digit
follow-up speed ………………………………………. > 1 007s
mean settling time …………………………………… < 3 h
freedom of roll and pitch ………………………….. ±40°
linear mean settle point error …………………… <0.1° sec lat
static error ……………………………………………… < 0.1° sec lat
dynamic error …………………………………………. < 0.4° sec lat
max. deviation after power interruption
of 3 min…………………………………………………… < 2°
Ambient Temperature Range
operation ………………………………………………… -10 – +55 °C
storage …………………………………………………… -25 – +70 °C (w/o supporting fluid)
Power Supply supply voltage …………………….. 115/230 V~ ±10%;
including automatic switchover to 24 V emergency power supply in accordance with GMDSS rules for
INMARSAT/SES terminals or …………………… 24VDC (18-36 V)
Protection Grade ……………………………………… IP 23 in accordance with DIN 40050
Environmental Requirements and EMC …….. in accordance with IEC 945
Power Consumption DC AC
start-up …………………………………………………… 80 W 125 VA
operation ………………………………………………… 45 W 75 VA
each analogue repeater ……………………………… 7 W 7 VA
each digital repeater …………………………………. 7 W 7 VA
Data Outputs
- repeater outputs 12 ( gyrocompass heading, magneticcompass heading, rate of turn, heading reference status; supply power24 VDC, max. 7 W each )
- data outputs NMEA ( 2gyrocompass heading, magnetic compass heading, rate of turn, position, speed, heading reference status )
- data outputs RS 422 3 ( gyrocompass heading, magnetic compass heading, rate of turn, position, speed, heading reference status, gyrocompass heading, magnetic )
- data output RS 422 FAST 1 ( compass heading, rate of turn, position, speed, heading reference status, gyrocompass heading, magnetic compass heading, rate of turn )
- data output RS 422 SUPERFAST 1 ( gyrocompass heading, magnetic compass heading, rate of turn, heading reference status )
- 6 step/°-outputs 2 ( act. heading; 24 VDC, max. 18 W (12 -70 VDC with ext. power supply) )
- analogue rate of turn output 1 ( ±0.1-999.9 mV/7min, settable; max. 10V, 10 mA )
- voyage data printer output 1 ( act. heading, rudder angles, date, time, heading reference, steering mode, speed, position )
Alarm and Status Outputs
- Power failure / general device error alarm …. potential-free contact; max. 30W, 1 A; 125 V
- AC power supply………………………………………. potential-free contact; max. 30W, 1 A; 125 V
- AC power supply………………………………………. potential-free contact; max. 30W, 1 A; 125 V
- Heading reference status (G1/G2/Mag)………. potential-free contact; max. 30W, 1 A; 125 V
- Heading difference alarm………………………….. potential-free contact; max. 30W, 1 A; 125 V
- Max ROT alarm………………………………………… potential-free contact; max. 30W, 1 A; 125 V
- Watch alarm trigger output……………………….. potential-free contact; max. 30W, 1 A; 125 V
Data and Signal Inputs
Magnetic Heading
- Fluxgate sensor
- Sin/Cos type or electronic compass
- NMEA 0183 or PLATH-format
Heading Gyro 2
- NMEA 0183
- PLATH-format
- Lehmkuhl LR 20 or LR 40
Position
- NMEA 0183
Speed
- NMEA 0183 or 200 pulses/nm
rudder angle 2
- independent rudder angles
- analogue (feedback, potentiometer)
Steering Mode
- sei. switch status
Heading Reference Ext. (Gyro/Mag;G1/G2)
- sei. switch status
Time Const. ROT
- sei. switch status
Ext. Alarm Acknowledge
- sei. switch status
Dimensions and Weight
- Width 404 mm
- Height 520 mm
- Depth 420 mm
- Front plate control unit 96 x96 mm
- Weight 25 kg
