She just tilts her head, but doesn't stop him. If he wants to get Security called on him, that's his prerogative. Her presence won't help him with that at all, since she's not a commissioned officer, nor part of this crew.

"Isolinear," she says simply. Because that is what the ships' systems use, at least in a ship like this one.

And as she has something of a strange sense of humor, she's not telling him that she'd already gotten coordinates from the Ensign she'd demanded answers from. Seven is already well aware of where they are oriented in space, but she's deemed it irrelevant for the moment.