I'd have to agree with Boasun. Learning to handle the boat without the bowthruster is key for when the bowthruster fails... If you've never tried parking the boat without the bowthruster and then suddenly have to do it... I feel very sorry for anyone with their boat near your slip.
Largest single screw vessel that I've operated with no bow thruster is 65 ft.
The largest twin screw vessel that I've operated with no bow thruster is 182 ft.
Though I've have used bow thrusters, the conclusion is that you should learn how to handle your vessel without the bow thruster before you start using one. That way if you do lose that thruster, your skills will still let you dock the vessel or get away from the pier.
So a bow thruster is nice to have but Learn to do without because you may end up without one.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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