1. A simple dry magnetic pocket compass A compass, magnetic compass or mariner's compass is a navigational instrument for determining direction relative to the earth's magnetic poles. 简单的干磁袖珍罗盘。罗盘，磁性罗盘或水手的罗盘是航海仪器，可以定位相对于地球磁极的方向。
2. Digital Compass : This option consists of the digital compass readout that shows you a directional compass heading along with a bar graph display of the direction your going. 数字指南针：这个选项包括数字罗盘读数表明您定向罗盘标题连同条形图显示您的方向去。
3. Gyroscope drift and its measurement. B. Principle of typical gyroscope instruments, such as gyro compass, gyro north finder, gyro horizon, platform compass, rate gyroscope and integrating gyroscope. 典型陀螺仪器（包括陀螺罗经、陀螺找北仪、陀螺地平仪、平台罗经、速率陀螺仪和积分陀螺仪等）的工作原理；
4. Gyroscope drift and its measurement. B. Principle of typical gyroscope instruments, such as gyro compass, gyro north finder, gyro horizon, platform compass, rate gyroscope and integrating gyroscope. 典型陀螺仪器（包括陀螺罗经、陀螺找北仪、陀螺地平仪、平台罗经、速率陀螺仪和积分陀螺仪等）的工作原理；
5. Gyroscope drift and its measurement. B. Principle of typical gyroscope instruments, such as gyro compass, gyro north finder, gyro horizon, platform compass, rate gyroscope and integrating gyroscope. 典型陀螺仪器（包括陀螺罗经、陀螺找北仪、陀螺地平仪、平台罗经、速率陀螺仪和积分陀螺仪等）的工作原理；
网络释义
bow compass spring bow compasse spring compass 弹簧圆规;
bow compass spring bow compasse spring compass 弹簧圆规;
