A vessel specialized in scientific investigation and research of water bodies. Or it can be a tool for transporting marine scientists to the site, using specialized instruments and equipment to directly observe the ocean, collect samples, and study the ocean. Equipped with specialized instruments and devices, lifting equipment, work decks, research laboratories, and facilities that can meet the long-term work and living needs of all personnel on board to carry out inspection tasks, it should have endurance and self-sustaining capabilities that are suitable for the mission.

A hovercraft is a high-speed vessel that utilizes the principle of surface effect to create an air cushion between the hull and the support surface by relying on air pressure higher than atmospheric pressure, allowing the hull to sail completely or partially away from the support surface. Air cushion vehicles are often made of light alloy materials and are equipped with power devices such as blowers, light diesel engines, or gas turbines that generate air cushions and drive the ship forward. They also have propellers such as air propellers, water propellers, and water jet propellers. The high-pressure air generated by the blower is sent into the air chamber of the bottom cavity of the ship through the pipeline to form an air cushion to support the ship, and the engine drives the propeller to make the ship sail close to the support surface.

A high-speed catamaran is a ship constructed by horizontally connecting two individual vessels together. Modern high-performance catamarans mainly include four categories: small waterline area catamarans, wave piercing catamarans, high-speed catamarans, and composite catamarans. High speed catamarans are one of the rapidly developing types of catamarans today. The typical appearance of a high-speed catamaran consists of two slender single hulls (referred to as hulls), connected by a deck at the upper part of the hulls. The hulls are equipped with power plants, power stations, and other equipment. The upper part of the deck bridge houses the superstructure, with cabins and living facilities inside.

Sailboat is a ship that uses wind power to move forward. It is an ancient water transportation tool after boats and rafts, with a history of more than 5000 years. According to the number of masts, it can be divided into single masted sailboats, double masted sailboats, and multi masted sailboats; Divided by ship type, there are flat bottomed and pointed bottomed sailboats; According to the head type, sailboats are divided into wide headed, narrow headed, and pointed headed.

The Flying Dolphin is a high-speed catamaran primarily used by the Greek company Hellenic Seaways. This type of ship has transported hundreds of thousands of Greeks and foreign passengers in the Gulf of Argos in the past 50 years. Flying dolphins first arrived in Greece in the early 1960s, but it was not until the mid-1970s that they began to be widely used by organizations.

The CT191 trawl fishing vessel is a large commercial fishing vessel, and its free deck is the main deck. The cab is located on the upper deck. There are 4 watertight partitions under the free board deck. The propeller is provided by a diesel engine and drives a fixed pitch propeller under the nozzle through a gearbox. The fishing boat is equipped with "towed" fishing gear. There are 3 hydraulic Bopu winches on the deck, 4 hydraulic network Bopu+2 Bopu winches.

Fishing boats are vessels used for catching and harvesting aquatic animals and plants. This also includes some auxiliary vessels for modern fishing production, such as those used for aquatic product processing, transportation, aquaculture, resource investigation, fisheries guidance and training, and for carrying out fisheries management tasks. To ensure the quality of the catch, preservation is one of the important functions of fishing boats. The preservation methods on board generally include ice storage, cold seawater preservation, salt storage, micro freezing, freezing, etc.

This trawler is a two-layer fishing vessel (main deck and upper deck) with a central passage. The free deck is the main deck. The cab is located on the upper deck. There are 4 watertight partitions under the free board deck. The propeller is provided by a diesel engine and drives a fixed pitch propeller under the nozzle through a gearbox. The fishing boat is equipped with "towed" fishing gear. There are 3 hydraulic Bopu winches on the deck, 4 hydraulic network Bopu+2 Bopu winches.