Determining the ship’s speed using the log speed. For electro-mechanical and impeller-type logs, the Log Correction (or Log Coefficient) does not vary with vessel speed. The Log Speed turns into True Speed using the Log Correction (or Log Coefficient). Just as for the distance correction.
The log in a region with marine currents. To determining the Log Correction or Coefficient in a region with marine currents, proceed as follow:
The Log History: This post, ‘The Log History’, has connection with the history of maritime navigation, and not with the modern navigation. But, are interesting.
The Log. General knowledge on travelled distance: The Log: Navigation device on board of the ships used for measuring speed and distance travelled in a given time.