Updated 12.24pm: Across the Tasman, New South Wales Governor David Hurley has spoken of the Anzac spirit at Sydney's dawn service.

He says when Anzacs are given a job we will give it our best shot, in success or failure, and make others proud.

"And while we're doing the job, we will look after our mates. And especially look after them, when all is done."

David Hurley says that out of the carnage of the Gallipoli campaign, three countries emerged with a new sense of nationhood - New Zealand, Australia and Turkey.

He says pride in the ANZACs has been one of the strongest and most enduring influences on the growth of his nation.

"At the time of Gallipoli our states had only been Federated for 14 years. As a nation, we hadn't quite shrugged off our colonial cloak."

Tens of thousands have solemnly commemorated the Anzac centenary at Sydney's Martin Place dawn service.

The last post and a minute of silence stilled up to 30,000 people, who bowed their heads or looked up to the sky to remember the fallen.

Hymns filled the air as poems and prayers were delivered.

NSW Premier Mike Baird laid a wreath at the cenotaph, followed by floral tributes from politicians, servicemen and women and NSW Police.

"We feel them still near us in spirit," he said.

Mike Baird delivered the dedication.

"As the Dawn is even now about to pierce the night, so let their memory inspire us to work for the coming new light, in the dark places of the world."

Thousands are now making their way to the cenotaph to pay their personal tributes.