Using a highly accurate model of the vessel and its holds, LPS/SMT simulates and displays the size, shape, and characteristics of the piles when loading cargo. These calculations are made according to the method of filling, the cargo's angle of repose, the trim and heel of the vessel, and the size and position of the loader heads (whether stationary or moving). More than one loader at a time may be simulated. Likewise, LPS/SMT will calculate and display pile shape and characteristics while unloading - using computer models of the gates (self-unloading) or the hatches (gearless) being used. Throughout the loading and unloading processes, the ship's hydrostatic and stress parameters are constantly calculated by the hydrostatics engine.

The system works with the concept of a "voyage scenario", which means that stowage planners may access the ship's loading condition at any port within the current voyage. If any changes occur at one port, loading conditions are automatically updated for all subsequent ports. LPS/SMT also performs space conflict control in each port, to prevent any inadvertent overlapping of different cargoes during the same time period.

Data regarding the voyage is easily transferred between planners, vessels, and offices throughout the customer's locations. Planners can save, export and import data in electronic format, and can produce hardcopy reports in the formats adopted by SMT.