The Tactical Performance Simulation
Once the voyage parameters have been set the simulation is run. The simulator first uses actual voyage data, in conjunction with empirical performance algorithms and historical data, to predict the performance of the vessel in all sea states. This procedure is similar to that used in conventional C/P performance reports but also relies heavily on the actual vessel performance during the voyage in question.
Using established Isochronal routing methodologies the Adjusted Least Distance Track (ALDT) is calculated. The ALDT is the least distance track between start and end points after adjustment for the minimum required deviation for bad weather as defined in the voyage parameters. The time and fuel expended on the ALDT is now the “budget” for the passage in question.
Tactical Performance is expressed as the ratio between steaming time on the Actual Vessel Track and the projected steaming time on the Least Distance Track after minimum required deviation for bad weather . This can be expressed as follows:
A value of 100 is returned when steaming time on both the Adjusted Least Distance Track and the Actual Vessel Track are the same. Tactical Performance = 100 essentially means that time and fuel expended on passage is what may be expected for the actual meteorological conditions. If Tactical Performance is greater than 100 then the voyage was cost effective from the perspective of the operator. A value of less than 100 indicates that the route followed was not the most commercially expedient within the constraints imposed by the weather.
Click the links above to see a sample Tactical performance report with voyage video.