This document contains the full specification of the sea ship register. The objective is to create computerized information system of the existing sea ship register. This register is of primary type among the other registers of the Republic of Lithuania and it is for gathering and storing the ship data, the data connected to the ship and generating the unique identification code, which will be used in other state registers and information system to uniquely identify the ship. During the creation process of this register, the project drivers, activity diagrams, user requirements, functional and non-functional system requirement specifications, project constraints and other specifications and diagrams were analyzed, produced and documented in this documentation. The detailed specifications of database objects (datafiles, tables, functions, procedures, packages, triggers and etc.), forms, reports and libraries were generated and attached here. The information system of the sea ship register helps personel to easily enter and store the required data into the database, to quickly find the needed ship by various search criterias. The register provides all the required certificates and other reports in printable version. The register is fully functional and officially put in use since 2006-01-01.