HMAS Diamantina Lieutenant Commander Andy Duff will speak about the Gallipoli landing on April 25, 1915, followed by successive war fronts from a naval perspective.

"The key message is the Anzac spirit and how, 90-odd years on, it's still in the service," Lt Commander Duff said.

The 37 personnel of the Diamantina, a 720-tonne minehunter that docked in Port Kembla harbour yesterday, will attend the dawn services at both Wollongong and Port Kembla before leading the march through Wollongong at 10am and joining the service at Wollongong Town Hall afterwards.

Lt Commander Duff continues 200 years of maritime history, and his family can be traced back to Captain George Duff, Commanding Officer of HMS Mars at the Battle of Trafalgar.

He joined the Royal Navy in 1987 before transferring to the Royal Australian Navy and moving to Australia in September 2006.

"This is only my third Anzac Day ... I have been exposed to Anzac Day in Iraq and back in the UK with Australian officers who were on exchange," he said.

"I think there's 3000 (Australian) servicemen on duty throughout the world as we speak. Obviously it's a time to remember them.

"It's a very poignant moment for all servicemen who think of those who have gone before them and given their life, which is the ultimate sacrifice for their country."

Lt Commander Duff said one of the things that struck him on his first Anzac Day in 2007 was the amount of people who attended the dawn services.

"For me it was a very touching thing to see that people are very patriotic and do support their military," he said.

One crew member on the Diamantina hails from the Illawarra, Leading Seaman Cook Nathan Hawke of Wollongong.