error in the voyage
... error in setting-up 安装误差 error in the voyage 航程误差 error in valuation 估价误差 ...
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测量的航速、航程与船舶实际的航速、航程存在的误差，主要是由于超声波在水中的传播速度发生变化引起的，误差相对较小。
Measuring the speed, range and the actual speed of the ship, the range of error was mainly due to the spread of ultrasound in the water caused by the change in speed, the error is relatively small.
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