JRC ALPHAMIDICOURSE Mk2, Installation And Operation Manual, Page: 13 / 99

13 | Introduction
• 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.
III.3 Step Signal Type Repeater Signal Output Function
This system can drive the ship's repeater by the step signal of the Gyro Compass. Even when the Gyro Compass is
operated by the emergency power supply, the connected repeater can be driven (Repeater backup function).
Note Refer to the As Built plan kept on board for details of the repeater.
When the external heading sensor signal is connected to this system (magnetic compass system, etc.), the repeater
operates as follows, when the system is switched, see paragraph 2.6
Heading Sensor Selection
• When "GYRO" is selected: The step signal is sent by the Gyro Compass True Heading.
• When "EXT" is selected: The step signal is sent by the True Heading of the external heading sensor.
III.4 Serial Signal Type Repeater Signal Output Function
This system can drive the ship's repeater by the serial signal of the Gyro Compass.
Even when the Gyro Compass is operated by the emergency power supply, the connected repeater can be driven
(Repeater backup function)
When this system's serial signal is not used for the repeater, the following serial signals may be sent:
1. Output conformed to IEC61162-1.
2. Output conformed to IEC61162-2.
These signals can be individually set for each circuit.
Refer to the As Built plan kept on board for details of the repeater and the serial signal.
When the external heading sensor signal (the magnetic compass system, etc.) is connected to this system, the repeater
operates as follows, when the system is switched:
(Refer to paragraph 2.6 Heading Sensor Selection ).
• When "GYRO" is selected: The serial signal is sent by the Gyro Compass' True Heading.
• When "EXT" is selected: The serial signal is sent by the True Heading of the External Heading Sensor.
III.5 Automatic Speed Error Correction Function
This system has functions to calculate speed error, an inherent error to the Gyro Compass, and to correct it
automatically.
Required data of latitude and speed to calculate the speed error, are selected and entered into the individual systems of
{"GYRO" / "GPS"} and {"LOG (contact signal)" / "LOG (serial signal)" / "GPS" / "MANUAL"}.
Note For the selection of latitude and ship's speed input system, operate according to paragraph 1.7.3
Setting the Latitude Input Source and paragraph 1.7.4 Setting the Speed Input Source .
When "GPS" is selected as the input system, the serial signal conform IEC61162-1 is received.
When "LOG (serial signal)" is selected as the input system, the serial signal conform IEC61162-1 is received.
Also, when other than "MANUAL" is selected as the input system, speed error correction can be performed in real time.