Simrad GC80 Compact MK2 User manual

ENGLISH
GC80/85 Compact MK2
User Manual
www.navico-commercial.com

PREFACE
988-12718-003
Document history
Rev. 001 First issue.
Rev. 002 Added trademark section, disclaimer, and copyright section.
Added section about Master compass power switch.
Rev. 003 Updates to BAM conn. ext. cables, alarm code list, notes added.

Simrad GC80/85 Compact MK2 Gyro Compass
THIS PAGE INTENTIONALLY LEFT BLANK

PREFACE
988-12718-003 4
1PREFACE
1.1 Compliance statement
Navico declare under our sole responsibility that the GC80/85 conform
with the requirements of:
•The European Council Directive 2014/90/EU on Marine
Equipment modified by Commission Implementing Regulation
(EU) 2019/1397 - Wheelmark.
All compliance documents are available in the product’s section at the
following website: www.navico-commercial.com
1.2 Disclaimer
As Navico is continuously improving this product, we retain the right to
make changes to the product at any time which may not be reflected in
this version of the manual.
Please contact your nearest distributor if you require any further
assistance.
It is the owner’s sole responsibility to install and use the equipment in a
manner that will not cause accidents, personal injury or property damage.
The user of this product is solely responsible for observing maritime safety
practices.
NAVICO HOLDING AS AND ITS SUBSIDIARIES, BRANCHES AND AFFILIATES
DISCLAIM ALL LIABILITY FOR ANY USE OF THIS PRODUCT IN A WAY THAT
MAY CAUSE ACCIDENTS, DAMAGE OR THAT MAY VIOLATE THE LAW.
This manual represents the product as at the time of printing. Navico
Holding AS and its subsidiaries, branches and affiliates reserve the right to
make changes to specifications without notice.
Governing language
This statement, any instruction manuals, user guides and other information
relating to the product (Documentation) may be translated to, or has been
translated from, another language (Translation). In the event of any conflict
between any Translation of the Documentation, the English language
version of the Documentation will be the official version of the
Documentation.
1.3 Copyright
Copyright © 2021 Navico Holding AS.
1.4 Trademarks
Navico® is a registered trademark of Navico Holding AS.
Simrad® is used by license from Kongsberg.

Simrad GC80/85 Compact MK2 Gyro Compass
5 988-12718-003
1.5 About this manual
Intended audience
This manual is intended as a reference guide for installing, operating and
maintaining the Simrad GC80/85 Expanded MK2 Gyro compass.
The manual assumes that the operator is a qualified ship officer, or is
under supervision of a qualified person.
Important text conventions
In this manual, references to buttons on the operator panels are written in
boldface, but in a different text style (e.g. SET button, DISP button, GYRO
button).
Important text that requires special attention from the reader is
emphasized as follows:
Note!
Used to draw the reader’s attention to a comment or some important
information.
Caution Used for warning the reader that a risk of damage to the equipment
exists if care is not exercised.
WARNING Used when it is necessary to warn personnel that a risk of
injury or death exists if care is not exercised.

CONTENTS
988-12718-003 6
This manual is divided into the following sections:
1. Preface
2. System overview
An overview of the GC80/85 Compact Gyro system and its components.
3. User interface
An overview of the GC80 Compact MK2 Control unit and the user interface.
4. Operation
Main operating procedures for using the GC80/85 Compact MK2 Gyro compasses.
5. Maintenance
Simple maintenance procedures that should be performed by the system operator, together
with a complete procedure for how to replace the Sensitive element and fuses.
6. Installation
Mechanical installation, cable connection, and software configuration for the GC80/85
Compact Gyro system.
7. Advanced settings
A description of parameters that can be entered or changed in the Extension menu.
8. Technical specifications
Specifications for the system and for all separate units in the GC80/85 Compact Gyro system.
9. Drawings
Dimensional drawings and wiring diagrams for the GC80/85 Compact Gyro system.
10.Part list
List of all standard and optional units that are used in the GC80 and GC85 Compact Gyro
systems.
11. Terminal layout
List of all terminal pins and terminal labelling with details on PCBs in the GC80 Control unit.
12. DIP switch settings
Drawings and references of jumpers and DIP switches for the different printed circuits boards in
the Control unit.
13. Alarm messages and corrective actions
A description of how system errors are indicated and corrective actions that can be performed
by the operator.

Simrad GC80/85 Compact MK2 Gyro Compass
7 988-12718-003
Contents
1PREFACE........................................................................................................................4
1.1 Compliance statement........................................................4
1.2 Disclaimer........................................................................4
Governing language......................................................4
1.3 Copyright.........................................................................4
1.4 Trademarks......................................................................4
1.5 About this manual .............................................................5
Intended audience........................................................5
Important text conventions............................................5
2SYSTEM OVERVIEW ................................................................................................... 12
2.1 Introduction ................................................................... 12
2.2 Precautions in use ........................................................... 12
2.3 System components......................................................... 13
2.4 Bearing repeaters............................................................ 13
3USER INTERFACE........................................................................................................ 16
3.1 GC80 Compact MK2 Control unit ........................................ 16
4OPERATION................................................................................................................ 19
4.1 System start-up and shut-down......................................... 19
Start-up.................................................................... 19
Turning the Gyro compass OFF..................................... 20
4.2 Selecting active compass.................................................. 21
4.3 Adjusting dimming level ................................................... 21
4.4 Displaying present settings ............................................... 22
Displaying settings with no external sensor connected...... 22
Displaying settings with external sensor connected.......... 24
4.5 Confirming present settings .............................................. 25
True bearing.............................................................. 25
Latitude.................................................................... 25
Speed ...................................................................... 26
4.6 Pendulum function........................................................... 29
4.7 Alarm messages.............................................................. 30
Acknowledging an alarm.............................................. 31
Central Alarm Panel.................................................... 31

CONTENTS
988-12718-003 8
BAMS....................................................................... 31
5MAINTENANCE........................................................................................................... 33
5.1 General.......................................................................... 33
5.2 Precautions .................................................................... 33
5.3 Cleaning the operator panels and the cabinet surface............ 33
5.4 Checking the connectors................................................... 33
5.5 Checking mechanical installation........................................ 33
5.6 Preventive maintenance intervals....................................... 34
5.7 Replacing the Sensitive element......................................... 34
Mechanical installation ................................................ 34
Verifying the element’s tilt angle................................... 38
Parameter updates..................................................... 39
Balancing the Horizontal ring........................................ 40
Adjusting the Rotor balance ......................................... 41
5.8 Replacing the fuses.......................................................... 42
Master compass......................................................... 42
Compact MK2 Control unit ........................................... 42
Power supply unit (option)........................................... 44
6INSTALLATION........................................................................................................... 46
6.1 Unpacking and handling ................................................... 46
6.2 Mechanical installation...................................................... 46
Control unit............................................................... 47
Power supply unit (option)........................................... 49
Master compass......................................................... 50
6.3 Cabling.......................................................................... 51
6.4 Grounding the units ......................................................... 51
6.5 DIP switch and jumper settings.......................................... 51
Activating the GC80 or GC85 Control unit....................... 52
Activating an external heading sensor............................ 53
HDT/THS .................................................................. 54
Activating the pendulum function.................................. 55
Activating external/internal reset of external/internal buzzer
alarm....................................................................... 56
6.6 Installing the Sensitive element ......................................... 57
Verifying the element’s tilt angle................................... 59

Simrad GC80/85 Compact MK2 Gyro Compass
9 988-12718-003
6.7 System start-up and software configuration......................... 61
System start-up......................................................... 61
Configuring the Gyro system........................................ 62
Setting the Latitude input source .................................. 63
Setting the Speed input source..................................... 64
6.8 Balancing the Horizontal ring............................................. 65
Adjusting True heading ............................................... 66
7ADVANCED SETTINGS ............................................................................................... 68
7.1 General.......................................................................... 68
7.2 Using the Extension menu................................................. 68
7.3 The Extension menu overview ........................................... 70
8TECHNICAL SPECIFICATIONS.................................................................................... 76
8.1 Accuracy........................................................................ 76
8.2 General specifications....................................................... 76
8.3 Input specifications.......................................................... 77
8.4 Output Specifications ....................................................... 79
8.5 Physical dimensions ......................................................... 81
GC80 Master compass................................................. 81
GC80 Compact MK2 Control unit................................... 81
GC80 Power supply unit (option)................................... 81
8.6 Power............................................................................ 81
GC80/85 Master compass............................................ 81
GC80 Compact MK2 Control unit................................... 81
GC80 Power supply unit (option)................................... 81
8.7 Environmental specifications ............................................. 82
GC80/85 Master compass............................................ 82
GC80 Compact MK2 Control unit................................... 82
9DRAWINGS ................................................................................................................. 84
9.1 Drawings included ........................................................... 84
10 PART LIST ................................................................................................................... 92
10.1 GC80 Compact Gyro system.............................................. 92
10.2 GC85 Compact Gyro system.............................................. 92
10.3 GC80/85 Optional equipment, Compact system.................... 93

CONTENTS
988-12718-003 10
11 TERMINAL LAYOUT ................................................................................................... 95
11.1 ICNT board..................................................................... 95
TB1.......................................................................... 95
TB2.......................................................................... 98
TB3.......................................................................... 99
12 DIP SWITCH SETTINGS ............................................................................................ 101
12.1 Compact MK2 Control unit .............................................. 101
ICNT board ............................................................. 102
GPANEL-A board ...................................................... 105
13 ALARM MESSAGES AND CORRECTIVE ACTIONS ................................................... 110
13.1 The alarm system.......................................................... 110
13.2 Acknowledging an alarm................................................. 111
13.3 Fault finding ................................................................. 111
Main power failure.................................................... 111
Internal power failure in Control unit ........................... 112
Inverter malfunction................................................. 112
Zero cross failure ..................................................... 112
System communication failure.................................... 113
GPS communication or data malfunction ...................... 113
Internal communication error..................................... 114
External bearing sensor error..................................... 114
LOG (serial) communication or data malfunction ........... 114
Repeater error......................................................... 114
Failure when powering ON the Gyro compass................ 115
13.4 Complete alarm code list ................................................ 116
BAMS complete alarm code list................................... 118

SYSTEM OVERVIEW
11 988-12718-003
THIS PAGE INTENTIONALLY LEFT BLANK

Simrad GC80/85 Compact MK2 Gyro Compass
988-12718-003 12
2SYSTEM OVERVIEW
This section provides an overview of the GC80 and GC85 Compact MK2
Gyro compasses and their components.
2.1 Introduction
GC80 and GC85 Compact MK2 Gyro compasses have been designed for
any size of vessels to enhance the navigational capabilities and reliability.
The Gyro compasses eliminate the inconvenience and limitations of
magnetic compasses, and provide a variety of electrical outputs to supply
accurate and consistent heading information to other navigational
equipment.
GC80 and GC85 Compact Gyro systems have different Sensitive elements,
but use the same GC80 Compact MK2 Control unit. The systems are
identified by divergent DIP switch settings in Master compass and in the
Control unit.
Note!
A GC80 or GC85 system is identified by the labelling on top of the Master
compass’ case as shown in the figure below.
The labelling on the Control unit is identical for both Gyro systems.
SIMRAD GC85
BOW
2.2 Precautions in use
The GC80/85 Compact MK2 Gyro compasses display and outputs bearing
information. Although the system continually checks for faults while the
system is running, failures or malfunctions may occur.
Any errors in input information will generate an alarm. These errors may
also cause large jumps in the output bearing from the Gyro compass. If this
happens, any external equipment depending on the bearing output from
GC80/85 should be operated manually or switched to other bearing
sensors.
To assure long time safe operation, the following precautions should be
taken:
-Assure that the operator is familiar with the use of the Gyro
compass.

SYSTEM OVERVIEW
13 988-12718-003
-Perform daily checks to maintain normal system operation. Refer
MAINTENANCE page 33 onwards.
-If any unusual behavior is observed during daily inspections, the
cause should be found and corrected. If necessary, the local
Simrad dealer should be contacted.
-If any alarm is generated, verify the reason for the alarm.
2.3 System components
A GC80/85 Compact Gyro compass includes the following units:
-Master compass with Sensitive element
-Compact MK2 Control unit
-Power Supply unit (Optional)
Note!
For details, refer TECHNICAL SPECIFICATIONS, page 76.
2.4 Bearing repeaters
GC80 and GC85 outputs step and serial signals used for repeaters. Even
when the emergency power supply is used, the connected repeaters will
be powered by the repeater backup function included in GC80/85.
The following serial signals may be selected:
Lo speed: IEC61162-1 ed.4 (4800 and 38400 baud possible)
High speed: IEC61162-2 ed.1 (38400 baud possible)

Simrad GC80/85 Compact MK2 Gyro Compass
988-12718-003 14
Note!
A proprietary Tokimec serial signal may also be available, but this is
normally not used.
These signals may be set separately for each circuit. For connection of
repeaters, refer to the wiring diagrams from page 84 onwards.

SYSTEM OVERVIEW
15 988-12718-003
THIS PAGE INTENTIONALLY LEFT BLANK

Simrad GC80/85 Compact MK2 Gyro Compass
988-12718-003 16
3USER INTERFACE
This section gives an overview of the GC80 Compact MK2 Control unit and
the user interface.
3.1 GC80 Compact MK2 Control unit
The Control unit includes the Control panel for the Gyro compass.
A flush mount kit (part number 27101757) may be ordered from Simrad for
remote installation of the Control panel. Refer
Flush mounting the
Control panel , page 47.
POWER button
Used for turning the Gyro system ON. The button will be lit to indicate that
power is supplied to the system. Refer
System start-up and shut-down, page 19.
Display
The LCD displays data in 2 rows: the upper row shows data and the lower
row shows active mode.
-The Data indicator consists of 4 7-segments red LEDs.
The indicator is used to display the vessel’s bearing,
latitude and speed. Refer
Displaying present settings
page 22.
The Data indicator is also used for displaying alarm
codes as described from page 29 onwards.
-The Mode indicator consists of 3 7-segments green
LEDs. The Mode indicator displays codes used for
identifying input type for bearing, latitude and speed.
GYRO button
GYRO
Used to select the Gyro compass as the active heading reference source.
The status lamp is lit to indicate that the Gyro system is active.
Refer
Selecting active compass
page 21.
EXT button
EXT
Used to select the external heading source as the heading reference. The
status lamp will be lit to indicate that the external heading reference source

USER INTERFACE
17 988-12718-003
is active.
Refer Selecting active compass page 21.
DISP button
DISP
Used to display data on the LCD. Refer
Displaying present settings
page
22.
SET button
SET
Used to change data and input sources. Refer
System start-up and
software configuration
page 61 onwards.
ACK/ENT button
ACK
ENT
Used to confirm a change in data and input sources. Refer
System start-up
and software configuration
page 61 onwards.
The button is also used to acknowledge an alarm as described in
Acknowledging an alarm, page 31.
ARROW buttons
DIM LAMP
TEST
Used to increase or decrease a parameter value. Refer
System start-up and
software configuration
page 61 onwards.
Also used for lamp testing and for setting the display illumination as
described on page 21.
Alarm indicators
Used to indicate an alarm situation. Refer
Alarm messages
, page 30.

Simrad GC80/85 Compact MK2 Gyro Compass
988-12718-003 18
THIS PAGE INTENTIONALLY LEFT BLANK

OPERATION
19 988-12718-003
4OPERATION
This section describes the main operating procedures used when
operating the GC80/85 Compact MK2 Gyro compasses.
4.1 System start-up and shut-down
A GC80/85 Compact Gyro system is usually left with power on. If the
system has to be shut down and restarted, follow the procedures
described in the following sections.
Start-up
Caution Before the Gyro compass is turned into normal operation, it has to be
configured according to the description in System start-up and
software configuration page 61 onwards.
1Turn ON the Gyro system by pressing the POWER button on the
Control panel. Follow the start-up sequence.
2Control unit type (GC80 Std, or GC85 HSc), software version for
Control unit and for Master compass is displayed in rapid succession.
Examples of display text are shown below:
OR
GC80 CONTROL
UNIT
STD VERSION
GC80 CONTROL
UNIT
HIGH SPEED
VERSION
SOFTWARE VERSION
CONTROL UNIT
SOFTWARE VERSION
MASTER COMPASS
GYRO
3If the rotor is not completely stopped when the POWER button is
pressed, a rotor break function will be activated to stop the rotor.
Active rotor break is indicated with flashing display.
4When the turning stops, the Sensitive element starts rising
horizontally and the compass rotates 360° clockwise. The display
shows decreasing bearing as the compass is turning.
GYRO
5When the compass has rotated 360°, start bearing is indicated with
flashing text in the display. The start bearing will be the same as
active bearing when the compass was turned OFF.

Simrad GC80/85 Compact MK2 Gyro Compass
988-12718-003 20
GYRO
6The indicated start bearing is accepted by pressing the ACK/ENT
button, or increased/decreased by using the ARROW buttons and
then pressing the ACK/ENT button. If no action is taken within 3
minutes, the start-up process will continue with the indicated start
bearing.
The bearing indication stops flashing when the start bearing is
accepted, while the lamp and the S.S.G. (mode) continues to flash.
7The rotor will now start rotating, and reaches full speed after
maximum 30 minutes.
GYRO
8When the rotor has reached full speed, the compass starts the north
seeking function. The display will now change to show the compass’
actual heading, and from now on bearing output will be available.
The lamp near the GYRO button changes from flashing to steady
light, but the S.S.G. (mode) continues to flash for 3 hours.
The GC80/85 will be settled within 3 hours when started with a deviation
angle less than 5°. With a larger deviation angle, the compass will be
settled within 4 hours.
Turning the Gyro compass OFF
1Press the POWER button on the Control panel. The light in the
POWER button will be switched off.
GYRO
2Re-press the POWER button to activate the rotor break function. The
light in the POWER button will be lit again.
Active rotor break is indicated with:
-flashing display
-a soft clicking sound heard from the Gyro compass
The rotor break function will be active for maximum 4 minutes.
Caution It is very important that the rotor break is activated to stop the rotor
rotation to prevent any possible damage by ship’s movement!
3Press the POWER button again to shut down the Gyro compass
when both the data and the dot in the display change from flashing
to steady light.
The light in the POWER button will now be turned OFF.