# Passage Two Gyro Compass Gyro Compass. Learning Objectives: Basic principles of Gyro Compass (GC) Basic principles of Gyro Compass (GC) Components of.

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Passage Two Gyro Compass Gyro Compass

Learning Objectives: Basic principles of Gyro Compass (GC) Basic principles of Gyro Compass (GC) Components of GC Components of GC Working procedures of GC Working procedures of GC Repeater synchronization procedures Repeater synchronization procedures Routine inspection of GC Routine inspection of GC A human gyrocompass

Vocabulary: indispensable /, indis'pensəbl / adj. 不可或缺的 indispensable /, indis'pensəbl / adj. 不可或缺的 gravitational adj. 地心引力的，引力作用的 gravitational adj. 地心引力的，引力作用的 motor and generator 变流机 motor and generator 变流机 distribution box 配电箱 distribution box 配电箱 switch junction box 开关接线箱 switch junction box 开关接线箱 azimuth /' æ ziməθ/ n. 方位角 azimuth /' æ ziməθ/ n. 方位角 mode selector switch 模式选择开关 mode selector switch 模式选择开关 knob /n ɔ b/ n. 旋钮 knob /n ɔ b/ n. 旋钮 slew /slu:/ n. vi. 回转，旋转 slew /slu:/ n. vi. 回转，旋转 identical /ai'dentik ə l/ adj. 相同的，同义词： same identical /ai'dentik ə l/ adj. 相同的，同义词： same ascertain /, æ sə'tein/ vt. 确定，核实，同义词： verify, confirm, make sure ascertain /, æ sə'tein/ vt. 确定，核实，同义词： verify, confirm, make sure voltage n. 电压 voltage n. 电压 malfunction / m æ l'f ʌ ŋk ʃ ən/ n. vt. 故障，失灵 malfunction / m æ l'f ʌ ŋk ʃ ən/ n. vt. 故障，失灵 with the exception of 介词词组，相当于介词 except with the exception of 介词词组，相当于介词 except

The gyro compass is an indispensable instrument for navigation as it functions as a true direction finder by seeking and continuously aligning itself with the meridian using the earth ’ s rotation and gravitational effects. Most gyro compasses consist of the master compass, the motor and generator, repeater compass, distribution box, switch junction box, alarm system, etc. The gyro compass is an indispensable instrument for navigation as it functions as a true direction finder by seeking and continuously aligning itself with the meridian using the earth ’ s rotation and gravitational effects. Most gyro compasses consist of the master compass, the motor and generator, repeater compass, distribution box, switch junction box, alarm system, etc. 陀螺罗经是航海不可或缺的仪器。它是真方向测向仪，可以利用地球 的旋转和地心引力作用寻找到子午线并不断与其校直来实现真方向的 测向。 direction finder ：测向仪 seeking and continuously aligning itself with the meridian ：并列动宾结构，是 seek the meridian 和 align itself with the meridian 的省略。

When the ship ’ s heading direction is given by a magnetic compass or if it is made known in reference to the azimuth of the quay wall, start the gyro compass according to the following procedures: When the ship ’ s heading direction is given by a magnetic compass or if it is made known in reference to the azimuth of the quay wall, start the gyro compass according to the following procedures: 1) Shift the mode selector switch on the switch panel of the power source unit to SLEW. Wait for some time until a red lamp lights (approx. 4 minutes). 2) When the lamp turns on, change over the slew switch either to the left or right. Then, turn the compass card according to the true bearing which has already been indicated (for synchronization). 3) Thereafter, shift the mode selector switch to RUN (at this time, a green lamp lights). In this case, the gyro compass gets set within two hours. In this case, the gyro compass gets set within two hours. When the ship ’ s heading direction is unknown, start the gyro compass by shifting the mode selector switch on the switch panel of the power source unit to RUN (a green lamp lights at this time). In this case, the gyro compass gets set within 4 hours. To stop the gyro compass, shift the mode selector switch on the switch panel of the power source unit to OFF. When the ship ’ s heading direction is unknown, start the gyro compass by shifting the mode selector switch on the switch panel of the power source unit to RUN (a green lamp lights at this time). In this case, the gyro compass gets set within 4 hours. To stop the gyro compass, shift the mode selector switch on the switch panel of the power source unit to OFF.OFF 当磁罗经指出了船首向，或者根据码头岸墙的方位角推知， …… in reference to: 根据，关于，有时也可用做 with reference to Sperry37 的 5 种工作方式： 1 ） slew 旋转模式； 2 ） start 启动； 3)automatic level 自动校平； 4 ） run 运转； 5 ） run/slew 运转 / 旋转模式 get set: be ready (for work) 可以稳定指北 slower direct Run

In terms of repeater synchronization, the following procedures should be acted upon: In terms of repeater synchronization, the following procedures should be acted upon: 1 ） Shift the repeater switch to OFF and set the repeater to the reading on the master compass by turning the repeater synchronization knob. 2) When the repeater has been set to the reading of the master compass, turn on the repeater switch to confirm that the master compass and repeater give the same readings. 3) Should these readings be not identical, repeat the above specified setting procedures. Normally, the repeater switch is kept turned on and is capped so that it will be free from being accidentally touched by the operator. Normally, the repeater switch is kept turned on and is capped so that it will be free from being accidentally touched by the operator. 如果这些读数不相等，应重复上面所规定的设置操作过程。 Should … be … ：倒装的虚拟语气句，相当于： If these readings should not be identical, … （做）分罗经调谐 adjust covered

Routine inspection of the gyro compass includes: Routine inspection of the gyro compass includes: 1) Check the repeaters with the master compass to ascertain that the transmission system is functioning properly. If the power supply fails for any reason, be sure to check it and, if necessary, synchronize the repeaters as soon as the power supply is restored. 2 ） Check the compass by azimuth observation when possible. 3 ） Make sure that the power supply voltage is constantly maintained. 4 ） Normal operation of the master compass should involve no noise, vibration or overheating. With this in mind, the operator should observe the performance of the gyrocompass and make the necessary adjustments should any malfunction develop. With the exception of the above-described routine inspection, the gyrocompass seldom requires special maintenance checks. It is desirable, however, to periodically check for loose connections, oil and component wear and to make the necessary adjustments when required. With the exception of the above-described routine inspection, the gyrocompass seldom requires special maintenance checks. It is desirable, however, to periodically check for loose connections, oil and component wear and to make the necessary adjustments when required. 传输系统 省略 if 的倒装虚拟条件句，还原后： if any malfunction should develop, …

Gyro Error – the difference between the true bearing and the Gyro reading Gyro Error – the difference between the true bearing and the Gyro reading Expressed in degrees East or degrees West Expressed in degrees East or degrees West Gyro Least, error East Gyro Best, error West

Home work: Read Part Two of this Chapter, and keep the following expressions in mind: Magnetic Compass Magnetic Compass Gyro Compass Gyro Compass compass bowl compass bowl binnacle stand binnacle stand nonmagnetic material nonmagnetic material gimbals gimbals compass card compass card cardinal and intercardinal points cardinal and intercardinal points deviation correcting devices [ semicircular deviation (B.C), quadrantal deviation (D), heeling error (H) correcting devices, flinder’s bar (F)] deviation correcting devices [ semicircular deviation (B.C), quadrantal deviation (D), heeling error (H) correcting devices, flinder’s bar (F)] deviation, variation deviation, variation semicircular curves semicircular curves

gravitational effects gravitational effects master compass master compass repeater compass repeater compass distribution box distribution box switch junction box switch junction box mode selector switch ( SLEW,AUTOMATIC LEVEL, etc) mode selector switch ( SLEW,AUTOMATIC LEVEL, etc) repeater synchronization repeater synchronization get set get set transmission system transmission system Preview Part Three: GPS, VDR, AIS and ECDIS

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