Why Speed Through Water is so significant in Ships' Performance Assessment?

Speed through water measurements should in theory not be affected by current. Speed log constitutes the only instrument onboard, which can provide such measurements even not so precisely.

Even a modern dual axis Doppler log cannot always be relied upon. Most errors are expected to be caused by irregular currents, shallow waters, ship motions etc..

The abovementioned factors can be identified automatically by a performance monitoring system, as SMM Ship Performance Service that correlates the inflow speed of the propeller with STW.




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