Turnbull said he was only moving the boat 20m between a jetty and the beach next to the house he shares with his wife Lucy while at home over Christmas.
After reports accompanying the photograph noted his breach of regulations, Turnbull said in a Facebook post the first he had learned of the rule was when he called Maritime Services.
“The rules can often seem very technical, but they are there to keep us safe and we should all comply with them,” he said.
“So lesson learned; I will make sure I always wear a life jacket in my dinghy regardless of how close I am to the shore, just as I always do on my kayak.”
Maritime Services investigated the incident and on Friday delivered a $250 fine. A spokesman for Turnbull said the fine would be paid.
Angus Mitchell, executive director of NSW Maritime, said the incident was a “timely reminder” of the need for safety on the water.
“We want to ensure everyone enjoys their break and gets home safely this summer so please, wear a lifejacket and take care on our waterways,” he said.
On Friday a 73-year-old man died and two others were rescued after their vessel capsized in seas off Kurnell in Sydney’s south.
Police said the the three men were “caught out by the waves” and were not believed to be wearing life jackets. Police were checking whether alcohol played any role in the tragedy.
Marine Area Command Inspector Darren Wood urged all boating enthusiasts to wear life jackets.
“It is your best chance of survival should you be thrown into the water,” he said.
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