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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