One of the key modules used in making of all the commercial ports of call in the order of vessel visits. It provides a seamless interface with other modules such as Booking, Documentation and Equipment control system. It also links with other modules, to ensure that all modules are synchronized and use the same schedule data. It provides version number mechanism to maintain any modification to original voyage schedule. Business user can analyze planned schedule vs. actual schedule once voyage is closed. Multiple vessel schedules can be created and used for planning/modeling. Once a schedule is executed in SISO.LLS, business user can perform different transactions on specific vessel/voyage such as revise schedule, report actual activity, and add/modify port details and so on.