(The bow thruster makes the boat easier to steer. Without the bowthruster, the only thing you can use to steer the boat is the rudder, which you can see on the back of the boat in the last picture. For the rudder to matter though, the boat has to be moving forwards or backwards, so docking can be really difficult, and a docking screw-up can be a pretty big deal with a boat this big.
This particular bow thruster is a tunnel thruster, because it's installed in a tunnel through the bow. The bump in front of it is called the fairing, and that's meant to prevent the tunnel from creating extra drag in the water.)
Hehehe. Bow thruster - sounds dirty to me. Because I'm a child apparently
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