Is this the smallest boat to have a bow thruster?

That's a trolling motor for fishing. Often put up on the bow.
That said, I've extensively driven a 5.4m RIB with not only a (retracting) bowthruster, but a (retracting) sternthruster too...admittedly a test-bed bed for systems development, but still....fun...outboard throttle/gear were also controlled by linear actuators, so it was full single-joystick control.
 
Could be. But I thought the way it was rigged was for use as a bow thruster.

I could easily be wrong. Mrs. M frequently tells me exactly that.

as i said it could be used as a bow thruster if it is pointed sideways or as a trolling motor if fore and aft.

I have a 12V thruster I use on the stern of my dingy which acts as an outboard in my configuration.

I also made an outboard leg and fitted a 12Vdc battery drill as a low power outboard/trolling motor
 
There used to be a small (about 6.5m) motor boat moored next to me. It had a bow thruster built in. The owner said that it was needed as with a fairly high cabin forward, no keel and a single outboard slow speed manouvering in a cross wind was a nightmare without it.
 
I sit corrected. I’ve not been in the med for a few years and I don’t ever remember seeing one before.
You actually mostly see them on inland waters....the fisherman sits on the bow...and uses foot controls to operate the trolling motor to stay in his fishing spot....
 
I know a guy who tried using a trolling motor as a bow thruster on his 31ft Westerly. It was surprisingly ineffective.
 
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