absolute log
绝对计程仪(absolute log)是记录船舶相对于海底的航速与航程； 多普勒计程仪、声相关计程仪。
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... 相对计程仪speed through the water log 绝对计程仪speed over the ground log 多普勒计程仪Doppler log ...
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它与电磁计程仪比较具有测量精度高；能够测量绝对航速、航程；能够测量船舶横向移动速度等优点。
With the electromagnetic Log compared with high accuracy, to measure absolute speed, range, to measure the ship horizontal speed advantages.
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