He and the passengers were thrilled to get such a close-up view of the impressive sea creatures.
"It was really amazing.
"I've worked with Monarch for three years and this was the first time I have seen them up this close here in Dunedin.''
Mr Wilson could not confirm a report the whales were back in Otago Harbour yesterday, but said it was possible.
Otago Peninsula Trust marketing manager Sophie Barker, who was aboard Monarch and captured some video of the whales, said it was an "amazing'' experience.
She believed the orcas might have been hunting baby seals.
"They were possibly looking for afternoon tea.''