JRC ALPHAMIDICOURSE Mk2 User manual

ALPHAMIDICOURSE Mk2
Gyrocompass
Installation and Operation MANUAL
The information in this Manual is subject to change
without notice and does not represent a commitment on
the part of ALPHATRON MARINE B.V.
Document : Manual ALPHAMIDICOURSE Mk2
Issue : 2.1
©ALPHATRON MARINE B.V.
ALPHATRON MARINE B.V.
Schaardijk 23
3063 NH ROTTERDAM
The Netherlands
Tel: [phone]
Fax: [phone]
P.O. Box 210003
3001 AA ROTTERDAM
Web:
www.alphatronmarine.com
www.jrc-world.com
Service request:
[email protected]
Technical support request:
[email protected]
Warranty request:
[email protected]

2 | Contents
Contents
I Preface..................................................................................................................5
I.1 Revision History.............................................................................................................................................................. 5
I.2 Points of Attention........................................................................................................................................................... 5
I.3 Glossary.......................................................................................................................................................................... 6
I.4 Storage........................................................................................................................................................................... 6
II Caution...............................................................................................................7
II.1 Warning Label................................................................................................................................................................. 7
II.2 Location Warning Label.................................................................................................................................................. 7
II.3 Cautions.......................................................................................................................................................................... 7
III Introduction......................................................................................................12
III.1Display and Alarm......................................................................................................................................................... 12
III.2Types of Alarm Functions............................................................................................................................................. 12
III.3Step Signal Type Repeater Signal Output Function...................................................................................................... 13
III.4Serial Signal Type Repeater Signal Output Function.................................................................................................... 13
III.5Automatic Speed Error Correction Function ................................................................................................................. 13
III.6Rate of turn signal output function ................................................................................................................................ 14
III.7Timer Start.................................................................................................................................................................... 14
III.8Function of the External Heading Sensor ..................................................................................................................... 14
III.9Pendulum Function....................................................................................................................................................... 14
III.10 Warranty Conditions................................................................................................................................................... 15
III.11 Ordering of additional items........................................................................................................................................ 15
1Installation Instructions ..................................................................................16
1.1 Installation Guidelines................................................................................................................................................... 16
1.1.1 General and Specific Tools.................................................................................................................................. 16
1.1.2 Unpacking of the AlphaMidiCourse Mk2.............................................................................................................. 17
1.1.3 Mounting of Master Compass.............................................................................................................................. 18
1.1.4 Fitting Master Compass....................................................................................................................................... 19
1.1.5 Remove Parts from Master Compass Mounting Ring.......................................................................................... 20
1.1.6 Remove Packing Material from Shock Absorbers................................................................................................ 20
1.1.7 Unpacking of Sensitive Element .......................................................................................................................... 21
1.1.8 Mounting of Sensitive Element............................................................................................................................. 22
1.1.9 Filling with Damping Oil ....................................................................................................................................... 23
1.1.10 Attach Connector to Sensitive Element.............................................................................................................. 23
1.2 Name and Function of Each Unit.................................................................................................................................. 24
1.3 Configuration ................................................................................................................................................................ 24
1.4 Connecting the AlphaMidiCourse Mk2.......................................................................................................................... 25
1.5 DIP Switch Settings ...................................................................................................................................................... 28
1.5.1 Dip Switch Settings Master Compass .................................................................................................................. 28
1.5.2 Dip Switch Settings Control Box Part 1................................................................................................................ 29
1.5.3 Dip Switch Settings Control Box Part 2................................................................................................................ 30
1.5.4 Dip Switch Settings GPANEL-A Board................................................................................................................. 31
1.6 Jumper Settings............................................................................................................................................................ 32
1.7 First Start-up procedure................................................................................................................................................ 33
1.7.1 Start-up Master Compass .................................................................................................................................... 33
1.7.2 Configuring the Gyro sphere ................................................................................................................................ 34
1.7.3 Setting the Latitude input source.......................................................................................................................... 34
1.7.4 Setting the Speed input source ............................................................................................................................ 35

3 | Contents
1.7.5 Balancing the Horizontal ring................................................................................................................................ 35
1.7.6 Adjusting True Heading........................................................................................................................................ 36
1.8 Advanced Settings........................................................................................................................................................ 37
1.8.1 Extension Menu overview..................................................................................................................................... 38
2Operation..........................................................................................................43
2.1 Operating panel ............................................................................................................................................................ 43
2.2 Explanation of the Operating Panel .............................................................................................................................. 44
2.3 Data Indications............................................................................................................................................................. 46
2.3.1 S.S.G and S.S.E................................................................................................................................................... 47
2.3.2 E.S.t and GYt....................................................................................................................................................... 47
2.3.3 C.P.S.................................................................................................................................................................... 48
2.3.4 Latitude................................................................................................................................................................ 48
2.3.5 Ship Speed........................................................................................................................................................... 49
2.3.6 Rate of Turn ......................................................................................................................................................... 49
2.3.7 Error..................................................................................................................................................................... 50
2.4 Start and Stop Sequence.............................................................................................................................................. 51
2.5 Start and Running......................................................................................................................................................... 52
2.5.1 Start...................................................................................................................................................................... 52
2.5.2 Set Timer Starting Time....................................................................................................................................... 53
2.5.3 Set Start Heading................................................................................................................................................. 54
2.5.4 Confirming Latitude Input..................................................................................................................................... 54
2.5.5 Synchronization of the Repeater Compass.......................................................................................................... 55
2.5.6 Settling Time........................................................................................................................................................ 56
2.5.7 Confirming Ship Speed Input............................................................................................................................... 56
2.5.8 Set Rate of Turn Filter Constant .......................................................................................................................... 57
2.6 Heading Sensor Selection ............................................................................................................................................ 57
2.7 Pendulum Function....................................................................................................................................................... 58
2.8 Monitoring while Running.............................................................................................................................................. 58
2.8.2 Confirmation of Alarm Status............................................................................................................................... 59
2.8.3 Confirmation of Gyro Compass True Heading..................................................................................................... 59
2.8.4 Confirmation of Latitude....................................................................................................................................... 59
2.8.5 Confirmation of Ship Speed................................................................................................................................. 59
2.9 Alarm ............................................................................................................................................................................ 60
2.9.1 Alarm List ............................................................................................................................................................. 61
2.9.2 Alarm list of Alert Management System (AMS) .................................................................................................... 62
2.9.3 Alert Priority (※4)................................................................................................................................................. 63
2.9.4 Alert Categories (※5)........................................................................................................................................... 63
2.10 Turning the Gyro Compass OFF................................................................................................................................. 64
3 Specifications....................................................................................................65
3.1 Input Signal Specifications............................................................................................................................................ 66
3.2 Output Signal Specifications.......................................................................................................................................... 67
4Maintenance.....................................................................................................68
4.1 General Procedures...................................................................................................................................................... 68
4.2 Periodical Checks......................................................................................................................................................... 69
4.3 Warning Label Check.................................................................................................................................................... 69
4.4 Spare Parts................................................................................................................................................................... 69
4.5 Disposal Method........................................................................................................................................................... 69
4.6 Replacement of Sensitive Element S/E ........................................................................................................................ 70
5Troubleshooting ..............................................................................................71
5.1 General ......................................................................................................................................................................... 71
5.2 Before Troubleshooting................................................................................................................................................. 71
5.3 Corrective Measures ..................................................................................................................................................... 72
5.3.1 Corrective Measures when an Alarm is Activated................................................................................................ 72

4 | Contents
5.4 Failure Phenomena and Corrective Measures.............................................................................................................. 72
5.4.1 Alarm code 1: Power Supply Failure .................................................................................................................... 72
5.4.2 Alarm code 2: Power Supply Abnormal................................................................................................................ 73
5.4.3 Alarm code 3: Inverter Failure.............................................................................................................................. 73
5.4.4 Alarm code 6: Rotor Level Failure........................................................................................................................ 73
5.4.5 Alarm code 8: Zero Cross Failure......................................................................................................................... 73
5.4.6 Alarm code A: System Communication Failure (1)............................................................................................... 74
5.4.7 Alarm code b: System Communication Failure (2)............................................................................................... 74
5.4.8 Alarm code c or d: GPS Communication Stop or Failure of GPS data................................................................. 74
5.4.9 Alarm code E or F: System Internal Communication Failure (1) or System Internal Communication Failure (2).. 75
5.4.10 Alarm code G: Master Compass Heading Failure.............................................................................................. 75
5.4.11 Alarm code L or n: External Heading Sensor Communication Stop or External Heading Sensor Data Failure .. 75
5.4.12 Alarm code P or U: LOG (serial signal) Communication Stop or LOG (serial signal) Data Failure..................... 75
5.4.13 Alarm code u: LOG Contact Failure ................................................................................................................... 75
5.4.14 Alarm code r: E5V Failure .................................................................................................................................. 76
5.5 Gyro Compass does not Function, when Power Switch turned ON. ............................................................................. 76
5.6 Alarm 3 and A are activated at the Same Time when Powering ON............................................................................. 76
5.7 Each repeater does not operate.................................................................................................................................... 76
5.7 Others ........................................................................................................................................................................... 76
5.8 Fuse Replacement........................................................................................................................................................ 77
5.8.1 Master Compass Inverter Fuse............................................................................................................................ 78
6Appendices......................................................................................................79
6.1 Drawings....................................................................................................................................................................... 79
6.1.1 Dimensions of Control Unit................................................................................................................................... 80
6.1.2 Dimensions of Master Compass........................................................................................................................... 81
6.1.3 Master Compass without housing ........................................................................................................................ 82
6.1.4 ICNT Board of Control Unit................................................................................................................................... 83
6.1.5 Connection Diagram............................................................................................................................................. 84
6.1.6 Cable Diagram ..................................................................................................................................................... 75
6.1.7 Installation Drawing.............................................................................................................................................. 76
6.2 Check Sheet [Maintenance] AlphaMidiCourse Mk2 ...................................................................................................... 77
6.3 Periodical Check Tables................................................................................................................................................ 83
6.3.1 Periodical Table (Once a day).............................................................................................................................. 83
6.3.2 Periodical Table (Once a (halve) year)................................................................................................................. 84
6.4 Return Slip Sensitive element ....................................................................................................................................... 85
6.5 Installation Drawing of AlphaHeading+.......................................................................................................................... 87
6.6 Installation Drawing of Bearing Repeater RP-51-1........................................................................................................ 88

5 | Preface
I Preface
The AlphaMidiCourse Mk2 Gyro compasses have been designated for any size of vessel to enhance the navigation
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.
•The AlphaMidiCourse Mk2 Compact gyro is designed for vessels with speeds of up to 50 knots.
•The AlphaMidiCourse Mk2 complies with IMO A.424 (11) and Wheelmark MARed - MED/4.3 Specifications.
I.1 Revision History
Revision Nr.
Description
Date
V1.0
First Issue
February 2016
V1.1
Update Dip switch settings for HDT/THS
September 2018
V1.2
Textual change, update part numbers
March 2019
V2.0
Updated to newest AlphaMidiCourse version Mk2
February 2021
V2.1
Updated Table Jumper, Fuses and terminal connections of ICNT
March 2021
I.2 Points of Attention
1. Thoroughly read this instruction manual before installation and operation of the equipment.
2. We recommend to keep this manual nearby the equipment to ensure ready access to it. Assign a person in charge
for maintaining this manual in an assigned place.
3. Users of this manual are assumed to be qualified personnel according to governmental law for ship's officers, or the
corresponding laws.
4. Relevant drawings of the As Built plan of this system should be kept together.
5. Only qualified personnel as described above, or personnel under the supervision of a qualified person should operate
this system. Do not permit unqualified personnel operate this system.
6. If the manual is lost, request a new copy from ALPHATRON MARINE.
7. If labels become unreadable, or detached, request new ones from ALPHATRON MARINE.

6 | Preface
I.3 Glossary
The meaning of standard definitions and terms as used in this manual are explained in the table of Definitions.
See below shown table.
Definition
Explanation
External Heading Sensor
General term for the Heading Detection Sensor for Magnetic Compass
System, Electronic Compass, GPS Compass, etc.
External Heading
Sensor Signal
Processing Unit
Optional unit to this system. It enables to completely backup several circuits of the
repeater signal (step signal / serial signal) by attachment of this unit when connected
to the external sensor.
Fixed Error
Error between this system and keel line depending on the installation.
Last Azimuth
This system can set and detect last azimuth of previous stop time. According to
this operation, system settling time can be reduced when started the system
again.
Leveling operation
Operation to keep the sensor horizontal
Magnetic Compass
System
The heading detector is mounted on the magnetic compass and detected heading
signal from the heading detector is sent out as repeater signal and serial signal.
Rate of Turn
Speed of ship's turning
Sensitive Element
Element to detect north of own ship
Speed Error Correction
Gyro-compass generates error from the North depending on the speed and
position of ship's navigation. This system automatically calculates and corrects this
error using speed and position data.
Step Signal
Three phase signal with resolution of 1/6°. Voltage is 24 V standard. 70 V / 35 V
output can be put out by expanding with the optional unit.
I.4 Storage
Observe the following items when storing:
1. Turn all power switches of this system to the OFF position to disconnect the power.
2. Storage temperature should be between –20℃to +55℃.
3. Avoid a place with high humidity as much as possible.
4. Prevent the storage place from generating corrosive gas, breeding of bacteria such as mold or intrusion of insects
and small animals.
5. Cover the system with a plastic sheet, etc., when generation of dust is foreseen. When welding works, etc., are
carried out near this system, provide suitable protection to prevent damage caused by sparks, etc.

7 | Caution
II Caution
To safely install and operate this instrument, so as not to adversely affect the warranty, the WARNINGS and CAUTIONS
must be adhered to.
II.1 Warning Label
The following warning label is attached to this system.
II.2 Location Warning Label
The warning label is attached to the inside of the door of the Control Panel. See paragraph 6.1.3: Stand alone type Control
Unit of One Gyro Compass System
II.3 Cautions
•WARNING - Clarification
•Indicates potential risk of injury or death to users of the product.
•WARNING - Operations
•Improper operations caused by failure of this product, or malfunctions caused by operator's misunderstanding
may cause collision or grounding and may result in property damage and environmental pollution. Also, death or
serious injury may happen.
•Full attention must be paid in the use of this product by understanding its limitations in performance and
characteristics. Thoroughly familiarize yourself with the operation of this product.
•WARNING - Operations
•Carefully observe the CAUTIONS and WARNINGS prior to starting up and operating this product.
•Read the Operator Manual of the automatic steering system carefully and prepare for the occurrence of trouble
or alarm in this product. Ensure the emergency steering method is well understood to quickly respond to
trouble.
•WARNING - Maintenance
•During maintenance or check of the product, touching internal parts may cause electric shock, because the
ship's power supply is still connected to the system distribution board, even if the main power switch ofthis
product is turned "OFF". Do not touch internal parts such as terminal boards, power supply unit, etc. If
necessary, disconnect the power cable from the ship’s distribution board. A warning label is attached to point
out this danger.
•WARNING
•Matters requiring attention in starting up and operations during progress are described in chapter Operations
and are punctuated with a CAUTION or a WARNING, which must be strictly observed.
•Attentively read the Operator Manual of the automatic steering system carefully preparing for occurrence of
trouble or alarm in this system. The emergency steering method should be well understood to easily respond to
failures, or alarms.
•WARNING - Power Supply Failure (alarm code 1)
•Pay full attention to avoid electric shock when checking the power supply.
•When checking fuses, turn "OFF" the power switch on the operating panel and further disconnect the power
cable from the ship’s distribution board before checking fuses.

8 | Caution
•WARNING - Inverter Failure (alarm code 3)
•When checking fuses, turn "OFF" the power switch on the operating panel and disconnect the power cable
from the ship’s Distribution Terminal Board.
•WARNING
•When checking fuses, turn "OFF" the power switch, and further disconnect the power cable from the ship’s
distribution terminal board.
•CAUTION - Clarification
•Indicates potential risk of damage to equipment.
•CAUTION - Prohibition
•Do not use insulation tester or other device to test system insulation as it will damage internal electrical
components. Always disconnect the wiring connected to this system before testing related power distribution
lines with such testers.
•CAUTION - General use
•This system displays Gyro Compass heading and outputs the heading information externally. Although the
safety design such as the alarm function against failure, etc., is provided, at the present time there is no
perfect safety design. In addition, as this system has many important functions, it is hard to say that any one
can use this system without failure. Failures or malfunctions of this system may cause distress, and full
attention should be paid in using this product. The use of this equipment does not absolve the user's
responsibility and obligation in practicing proper navigational techniques.
•Observe the following CAUTIONS:
•Always perform daily check to maintain normal system condition.
•When anomalies are detected as a result of daily checks, investigate and repair at once to restore to normal
conditions and request advice from Alphatron service engineer.
•When the alarm system is activated during use, always check to confirm the cause and reinstate.
•CAUTION - Types of Alarm
•When an alarm regarding GPS (alarm code "c" or "d") is activated and the Gyro Compass' True Heading has
not been determined, first turn the steering mode to "MANUAL", or "Non Follow Up", then determine the True
Heading, because wrong heading information (repeater signal and serial signal) may be sent out.
•When an alarm regarding LOG (serial) (alarm code "P" or "U") is activated and the Gyro Compass' True
Heading has not been determined, first turn the steering mode to "MANUAL" or "Non Follow Up", then
determine the True Heading, because wrong heading information (repeater signal and serial signal) may be
sent out.
•When an alarm regarding LOG Contact (alarm code "u") is activated and the Gyro Compass' True Heading
has not been determined, first turn the steering mode to "MANUAL" or "Non Follow Up", then determine the
True Heading because wrong heading information (repeater signal and serial signal) may be sent out.
•When an alarm regarding the EXTERNAL HEADING SENSOR (alarm code "E", "F", "L" and "N") is activated,
the heading information immediately before the alarm was activated is sent. First turn the steering mode
to "MANUAL" or "Non Follow Up", and then determine the true heading. Once True Heading has been
determined, the system's heading is sent out.
•When the system is turned on, first turn the automatic steering system to "MANUAL" or "Non Follow Up" to
prevent course turning with larger angle.
•CAUTION - Start Up
•Start up this product after turning the automatic steering system to other mode than "AUTO".
•CAUTION - Setting Latitude Input
•Change of the latitude input system, or a large change of latitude value may cause a large change in the True
Heading. When on automatic steering, first turn the steering mode of the automatic steering system to
"MANUAL" to prevent a large change of course. Confirm the area around the ship is clear and turn to "AUTO"
steering again.
•CAUTION - Setting Latitude Input
•When an alarm regarding GPS (alarm code "c" or "d") is activated and the Gyro Compass' True Heading has
not been determined, first turn the steering mode to "MANUAL", or "Non Follow Up", then determine the True
Heading, because wrong heading information (repeater signal and serial signal) may be sent out.

9 | Caution
•CAUTION - Setting Latitude Input
•When "GYRO" is selected for the latitude input system, latitude is automatically updated by the ship's speed
and the Gyro Compass True Heading. (When the ship's speed input system is "MANUAL", it is not updated
automatically.) During navigation, confirm once every two hours that the ship's actual latitude coincides with
the indicated latitude.
•CAUTION - Setting Latitude Input
•Press ACK/ENT switch (4) to complete the setting. Changed setting is not updated unless pressing ACK/ENT
switch (4).
•CAUTION - Setting Speed Input
•Change of the ship's input system or large change of ship's speed may cause large change of the True
Heading. When on automatic steering, first turn the steering mode of the automatic steering system to
"MANUAL" to prevent a large course change. Confirm the area around the ship is clear and turn to "AUTO"
steering again.
•CAUTION - Setting Speed Input
•When an alarm regarding GPS (alarm code "c" or "d") is activated and the Gyro Compass' True Heading has
not been determined, first turn the steering mode to "MANUAL", or "Non Follow Up", then determine the True
Heading, because wrong heading information (repeater signal and serial signal) may be sent out.
•CAUTION - Setting Speed Input
•When an alarm regarding LOG (serial) (alarm code "P" or "U") is activated and the Gyro Compass' True
Heading has not been determined, first turn the steering mode to "MANUAL" or "Non Follow Up", then
determine the True Heading, because wrong heading information (repeater signal and serial signal) may be
sent out.
•CAUTION - Setting Speed Input
•When an alarm regarding LOG contact (alarm code "u") is activated and the Gyro Compass' True Heading
has not been determined, first turn the steering mode to "MANUAL" or "Non Follow Up", then determine the
True Heading, because wrong heading information (repeater signal and serial signal) may be sent out.
•CAUTION - Setting Speed Input
•The setting of the ship's speed input system (and its values for "MANUAL") is automatically saved. When re-
starting, the previous ship's speed system setting is activated. When "MANUAL" is selected, stop after ship's
speed setting is set to zero knots. Also, when turning off and on again with "GPS" selected, confirm that GPSis
operating properly.
•CAUTION - Setting Speed Input
•Press ACK/ENT switch to complete the setting. Changed setting is not updated unless pressing ACK/ENT
switch.
•CAUTION - Setting "Rate of Turn Filter Constant"
•Press ACK/ENT switch to complete the setting. Changed setting is not updated unless pressing ACK/ENT
switch.
•CAUTION - Confirmation True Heading
•When the Gyro Compass' True Heading is set again, the repeater indication value and the serial signal Gyro
Compass True Heading will change by the altered angle. When on automatic steering, first turn the steering
mode of the automatic steering system to "MANUAL" to prevent a large course change. Confirm the area
around the ship is clear and turn to "AUTO" steering again.
•CAUTION - Confirmation True Heading
•Press ACK/ENT switch to complete the setting. Changed setting is not updated unless pushing ACK/ENT
switch.
•CAUTION - System Selection
•System selection (switching) may cause a large change of True Heading. When on automatic steering, first
turn the steering mode of the automatic steering system to "MANUAL" to prevent a large course change.
Confirm the area around the ship is clear and turn to "AUTO" steering again.
•CAUTION - Monitoring in Progress

10 | Caution
•Change of the ship's Speed Input System and the Latitude Input System, or large change of the ship's speed
and latitude, may cause a large change of the Gyro Compass True Heading. When on automatic steering, first
turn the steering mode of the automatic steering system to "MANUAL" to prevent a large course change.
Confirm the area around the ship is clear and turn to "AUTO" steering again.
•CAUTION - Confirmation of Latitude
•Change of the latitude input system or large change of the latitude may cause a large change of True
Heading. When on automatic steering, first turn the steering mode of the automatic steering system to
"MANUAL" to prevent a large course change. Confirm the area around the ship is clear and turn to "AUTO"
steering again.
•CAUTION - Confirmation of Ship Speed
•Change of the ship's speed input system or large change of the ship's speed may cause a large change of
True Heading. When on automatic steering, first turn the steering mode of the automatic steering system to
"MANUAL" to prevent a large course change. Confirm the area around the ship is clear and turn to "AUTO"
steering again.
•CAUTION - System Selection
•System selection (switching) may cause large change of True Heading. When on automatic steering, first turn
the steering mode of the automatic steering system to "MANUAL" to prevent a large course change. Confirm
the area around the ship is clear and turn to "AUTO" steering again.
•CAUTION - Operating Procedure Master Compass Switch (Option)
•DO NOT touch the Master Compass Power Switch while the Gyro Compass operates normally, to prevent
serious damage to the sensitive element, reduce the life cycle of the product, or unexpected problems. The
Master Compass Power Switch must be operated only when the master compass is in abnormal condition.
•CAUTION - Alarms
•When the following alarms are activated, the heading information from this system may not be sent at all, or
may have a large error. All units operated by the heading information from this system (in particular, the
automatic steering system, etc.) should be operated immediately according to the individual emergency
operating procedure.
•CAUTION - Corrective Measures GPS Communication Failure
•When an alarm related to GPS (alarm code "c" or "d") is activated and the Gyro Compass' True Heading has not
been determined, first turn the steering mode to "MANUAL", or "Non Follow Up", then determine the True
Heading, because wrong heading information (repeater signal and serial signal) may be sent out.
•CAUTION - Corrective Measures GPS Communication Failure
•Determination of the True Heading may cause large change of sent heading information. During automatic
navigation, great care should be taken, because large course changes may have happened.
•CAUTION - Corrective Measures EXTERNAL HEADING SENSOR Communication Failure
•When an alarm regarding the EXTERNAL HEADING SENSOR (alarm code "E", "F", "L" and "N") is activated,
the heading information (repeater signal and serial signal) immediately before the alarm generated is sent. First
turn the steering mode to "MANUAL" or "Non Follow Up", and then determine the True Heading. Once True
Heading has been determined, the system's heading is sent out.
•CAUTION - Corrective Measures EXTERNAL HEADING SENSOR Communication Failure
•Determination of the True Heading may cause large change of sent heading information. During automatic
navigation, great care should be taken, because large course changes may have happened.
•CAUTION - Corrective Measures LOG Communication Failure
•When an alarm regarding LOG contact (alarm code "u") is activated and the Gyro Compass' True Heading
has not been determined, first turn the steering mode to "MANUAL" or "Non Follow Up", then determine the
True Heading because wrong heading information (repeater signal and serial signal) may be sent externally.
•CAUTION - Corrective Measures LOG Communication Failure
•Determination of the True Heading may cause large change of sent heading information. During automatic
navigation, great care should be taken, because large course changes may have happened.
•CAUTION - Corrective Measures LOG Contact Communication Failure