The Log Correction. Determining the travelled distance:
The Log Correction: is the value, expressed as a percentage, which must be applied to the Log Distance to find out the True Distance travelled by ship.
The log is not a perfect device and it is affected by errors, that must be corrected to determine the True Distance.
Each log has his correction and, in addition to this, every log correction may vary depending on several causes.
The quality of a log is not determined by the value of his correction, but especially by the constant of the correction, according to various causes.
In general, the electro-mechanical and hydraulic logs have a constant correction, while the mechanical logs have a correction which varies with speed of the ship.
The Correction is determined as follows: the vessel is through a precisely known distance (True Distance) and compare this distance with the distance indicated by the log (Log Distance).
It is expressed as a percentage (%), to be applied easily at any distance indicated by the log.
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