Migaloo the white humpback whale reportedly seen off NSW Mid North Coast.

The albino whale was reportedly sighted off the state's South Coast on Tuesday and was expected to pass by Port Macquarie this morning during his annual migration from Antarctica to Queensland.

Flying instructor Ross Costanzo and his girlfriend Kym Machin took to the skies in search of Migaloo and believe they saw him about 1.5 kilometres off the coast near Hat Head.

"We saw quite a few whales, but we sort of looked between Crescent and Hat Head, then flew to South West Rocks," Mr Costanzo said.

"But when we came back it was right in our face — two big whales and one of them was white and we just honed in on them.

"Both me and Kym were pretty sure it was the famous Migaloo, but we're not experts on whales."

Ms Machin contacted the Migaloo Facebook Page and spoke to someone who was "fairly certain" it was Migaloo.

"Then next thing he rang back and said 'someone else saw one at Tacking Point,'" Mr Costanzo said.

"Unless there's two I don't know whether we saw the real McCoy."

Mr Constanzo said Ms Machin tried to snap a photo.

"It was hard to get the good shot, every time we came around and it was breaching, we thought we'd get a shot and then it just disappeared under again," he said.

"I'm convinced … I mean if the other sighting had a photograph then I might have some doubt, but I'm fairly sure what we saw was Migaloo.

"It's pretty special."

'Code Red! I've seen Migaloo'

Another unconfirmed sighting was reported at Port Macquarie's Tacking Point by Leigh Mansfield, a rescue manager for the Organisation for the Rescue and Research of Cetaceans in Australia (ORRCA).

At about 11:00am Mr Mansfield was in radio contact with a local whale-watching boat when he yelled out: "Code Red! … I've seen him, you should have 100 per cent visage do you?"

The boat quickly headed towards the area, and those on board said they thought they had seen the famous white whale.

"I'm not 100 per cent whether it's Migaloo or not," Mr Mansfield said.

"What I am seeing is a white humpback come up, but I'm not confirming it's Migaloo because there's that many different white whales out there.

"There's Panda that has a black dorsal fin who can come up, a lot of people see her and think it's Migaloo.

"There's about three or four others that are 80 per cent white and then have the black, and you aren't 100 per cent sure.

"We have one of the whale boats out there having a look and think they've seen him too.

"What looks like a white-humped whale has come up, but I won't confirm anything until someone really up near it sees it and gets a good photo."

Empty lenses

The whale-watching boat waited in the area for some time, but the whale dived under for an extended period and did not reappear.

"You need 150 per cent patience," Mr Mansfield said.

"What can you do?"

Later in the day an unconfirmed sighting of Migaloo was shared on Instagram by Jason Connell, who posted a photo of a white whale relatively close to shore, off Sharpes Beach at Skennars Head, near Ballina.

"I was surprised how close in he was, he was 300 to 400 metres offshore at best," Mr Connell said.

An ORRCA spokesperson said it was not possible to confirm Migaloo sightings without a clear photo.

Story By Luisa Rubbo and Emma Siossian