Marine thrusters are marine drive systems used for bow or stern watercraft maneuvering or as the primary propulsion drive system for watercraft. There are various types on marine thrusters. Azimuth thrusters feature propellers that can rotate 360 degrees around the vertical axis, providing both steering and propulsion capabilities. Tunnel thrusters have a propeller encased in a tunnel enclosure to direct thrust in one direction. Jet thrusters have pumps that deliver water to jet nozzles below the waterline to provide maneuvering thrust.
Image credit: Hangyu | West Marine