Dirk takes a pencil out of his front pocket and marks the spot that Daneel is pointing out. He'll check it for himself before he marks it in with pen. "No apology necessary. It isn't finished yet."

"I was actually..." He considers Daneel for a moment before taking his map back and folding it under his arm. "I've been at it a couple hours and was thinking of taking a well-deserved break. Where were you headed?" Why yes, this would be Dirk inviting himself along.