Table 1.

Classification and mission of the USV craft type [47].

Type	Description
Semisubmersible (SS) type	A semisubmarine with an average length of 7 m and a speed of 25 kn Less affected by maritime conditions than traditional types of ships Stable and widely used for transportation to supply equipment in the operating area Hard to detect in its SS form, which facilitates armed operations A more complicated design process than that of other vessel types
Conventional planning hull type	General ship type with various hull shapes V-type, modified V-type, and M-type High operational efficiency at a speed of up to 20 kn Large effective load Not complicated in design Low production costs Poor transportation stability Rolling and slam phenomena easily occur under the influence of sea conditions
Hydrofoil craft type	Strongest ability to adapt to sea conditions and good stability Speed up to 40 kn Outstanding operational efficiency Not suitable for towing owing to the characteristics of speed Complicated launching and recovery operations High costs of production (hull characteristics that can fold and unfold the wings of a ship)
Other craft types	More effective for a particular task in a particular hull. Used to overcome the limitations of space, movement, and temperature that humans cannot tolerate.