[ Engineering is arguably the most important part of the ship, or close to it; why wouldn't Spock be there? It's really the best place to start determining the capabilities of the ship and see if this promise of eventually returning home is a possibility.

He's stopped fiddling as much with the tricorder, wanting to converse power on it, and besides, engines are generally straightforward enough that he doesn't need to examine them with a machine. His eyes work just as well in this.

It's not so much Tony's comment that draws his attention to the engine as the engine itself, and he covers the distance to the engine easily enough. ]

I do not require sustenance at this time. And I am perfectly capable of finding locations on a ship.

[ This might not be the ship he calls home, but it's a ship and it's not like it's difficult to find the mess hall. Just look for the groups of people.

Though that might not be the case here. ]

What is the manner of your work?