A deckhand who enjoyed a drunken sex romp with her skipper while sailing a luxury superyacht from Brisbane to the Gold Coast admits she "did the wrong thing".

However, 26-year-old Cheya Handley pleaded not guilty in the Southport Magistrates Court to risking the safety of people on board when she was sailing the 80-foot (25-metre) Crystal Blue on March 3 last year.

Watch the video above.

The boat's skipper, 46-year-old Jeremy Piggott, has previously pleaded guilty and was fined $4000 for recklessly contravening his duty to ensure safety.

The pair were returning the boat after a charter trip and began drinking before having sex.

"Yeah, I did the wrong thing, drinking on the job. I should have known better, I screwed up big-time," Handley admitted in an interview with a maritime safety inspector played to the court.

"We were chatting, laying down, looking at the stars and then got it on."

The court heard the skipper repositioned one of the yacht's CCTV cameras a number of times throughout the night, so it wouldn't capture him having sex with the stewardess.

While they were "getting it on," the Crystal Blue hit a channel marker at Long Island around 11.20 pm.

Further south at Steiglitz, the vessel struck a moored yacht.

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It nearly hit another boat at Jacobs Well before running aground.

Apart from working as a deckhand on luxury yachts, it's understood Handley also works as a stuntwoman at Universal Studios in Japan.

The trial continues.