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.
当水深较深超过其跟踪水深时，计程仪只能对水层跟踪，测量相对水层的航速、航程。
When water deeper than its depth tracking, Log on only water tracking, measuring the relative speed of the water layer, the voyage.
电磁计程仪是一种相对计程仪，且为单轴计程仪，只能测量船舶相对水的纵向航速、航程，不利于大型船舶的操纵。
Electromagnetic Log is a relatively Log, and for single Log, the only measurement of the vertical ship relative speed of water, range, not conducive to the manipulation of large ships.
应经常测定计程仪改正率，以便利用计程仪航速推算船位时，将计程仪显示的航速改正为船舶实际航速。
Should always correct determination of the rate-of-way, in order to take advantage of projected Cheng-speed vessel position, the Log will show the correct speed for the actual speed of the ship.
应经常测定计程仪改正率，以便利用计程仪航速推算船位时，将计程仪显示的航速改正为船舶实际航速。
Should always correct determination of the rate-of-way, in order to take advantage of projected Cheng-speed vessel position, the Log will show the correct speed for the actual speed of the ship.
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