DEVICE: GYROCOMPASS
BRAND: SPERRY MARINE / C-PLATH
TYPE: NAVIGAT X MK2
ABOUT SPERRY MARINE NAVIGAT X MK2 GYROCOMPASS
Description
Design and Main Features
The NAVIGAT X MK 2 is a microprocessor controlled gyrocompass system with
integrated automatic North speed error correction.
The single unit design with a polyurethane hard foam housing allows the gyro-
compass to be installed on any bridge. If required, an optional remote operat-
ing unit may be installed.
The unique method of supporting the gyrosphere by means of mere buoyancy
ensures North stabilization during short power failures. E.g., 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 cor-
rect heading. The combined effects of the twin rotors and the liquid damping
system virtually eliminate latitude error.
Heading is measured as a 13-bit absolute value with a digital shaft encoder. The
high-speed follow-up system (follow-up speed upto 100°/s) ensures that accu-
rate heading and rate of turn data is provided under all operating conditions.
Integrated monitoring of the supply powers, gyroscope current and the follow-
up system ensure secure and trouble-free operation.
Data and Signal Interfaces
The NAVIGAT X MK2 provides input interfaces for a magnetic compass (flux-
gate sensor or electronic compass), speed log and position receiver.
The system provides four serial data outputs to analogue or digital repeaters
(including short-circuit-proof 24 VDC repeater power supply), two RS422 sen-
sor data outputs, a Fast output interface (reduced dataset) and a Superfast out-
put interface (adjustable baudrate, max. 38400 baud).
Furthermore, a Furuno AD10 heading output, a 6 step/0 heading output, and an
analogue rate of turn output are provided. One sensor data output may be con-
figured to produce a graphical heading printout in conjunction with the nav.
data printer NAVIPRINT.
The NAVIGAT X MK 2 may also be used as part of a component multicompass
system in conjunction with the Compass Monitor NAVITWIN III and a Switch-
Over Unit. In such a system, the Compass Monitor acts as the main heading
source selector and controls distribution of the compasses’ output signals via
the Switch-Over Unit.
Technical Data
heading display …………………………………………………. 4-digit
max. follow-up speed …………………………………………. 100°/s
mean settling time ……………………………………………… < 3 h
freedom of roll and pitch ……………………………………… ±40°
Accuracies
lin. mean settle point error …………………………………. < 0.1° sec lat
static error ………………………………………………………… < 0.1° sec lat
dynamic error ……………………………………………………. < 0.4° sec lat
deviation after 3 min. power interruption …………….. < 2°
Environmental Requirements
ambient temperature, operation …………………………. -10- +55 °C
ambient temperature, storage …………………………….. -25- +70 °C (w/o supporting fluid)
protection grade …………………………………………………. IP 23 to DIN 40050
Environmental Requirements and EMC ……………….. in accordance w. IEC 60945
Power Supply:
supply voltages main 24 VDC (18 -36 V),
backup 24 VDC (18-36 V);
including automatic switch-
over to 24 V backup supply
in accordance with GMDSS
rules for INMARSAT/SES
terminals
Max. Ripple Conten:
±4 Vpp; extreme values
may not exceed 36 V or fall
below 18V
Power Consumption
start-up ……………………………………………………………… 80 W
operation……………………………………………………………. 45 W
each analogue repeater ……………………………………….. 7 W
each digital repeater…………………………………………….. 7 W
Dimensions and Weight
width………………………………………….. 404 mm
height ………………………………………….520 mm
depth …………………………………………..420 mm
weight………………………………………….25 kg
DATA OUTPUTS
Repeater (4x NMEA)
gyrocompass heading
magnetic compass heading
rate of turn
heading reference status
4x supply 24 VDC,
max. 7 W each
Sensor Data (2 x RS422)
heading reference status
gyrocompass heading
magnetic compass heading
rate of turn
heading reference status
RS 422 Fast
gyrocompass heading
magnetic compass heading
rate of turn
heading reference status
RS 422 SuperFast
gyrocompass heading
magnetic compass heading
rate of turn
heading reference status
6 Step Output
act. heading
supply 24 VDC, max. 18 W
AD10 Output
gyrocompass heading
Rate of Turn, Analogue
±0.1-999.9 mV/°/min;
max. 10V, 10 mA
Navigation Data Printer
graph: act. heading;
text: date, time, heading
reference, steering mode,
speed, position
Alarm and Status Outputs
potential-free contact closures;
max. 30W, 125V/1A – each power failure / general device error heading difference alarm.
Data and Signal Inputs
magnetic heading ……………………………………………….. NMEA 0183 or PLATH -format or NAVITWIN III or NAVIPILOT
position ……………………………………………………………… NMEA 0183
speed …………………………………………………………………. NMEA 0183 or 200 pulses/nm
steering mode …………………………………………………….. (auto/man) sei. switch status
heading reference ext. (gyro/mag) ………………………… sei. switch status
ext. alarm acknowledge (mute) …………………………….. sei. switch status
