 Their positioning at various places along the length of the boat allows for directed jets of water in both the head or stern of the boat so that the boat may be steered away from obstacles and obstructions in its path, especially when coming to or away from a dock.Unlike propulsion thrusters, these positioning thrusters are usually significantly smaller because they only have to do small adjustments rather than moving the whole vessel (Kasuhik, 2019).Both bow and stern thrusters utilize through-hull tunnels meaning they go through the entirety of the boat's exterior without compromising its buoyancy or integrity.