Every hour, Nyad will stop swimming for just a few minutes to take in food and hydration.
The navigator will ensure Nyad is swimming in the right direction and guiding her to avoid detrimental ocean currents.
Boat captains will take shifts driving the five boats in Nyad's small armada.
"Today is more like swimming, " Nyad said in a quote on the blog.
One of the solo Lake Ontario swimmers was Diana Nyad, who on Sunday was attempting to swim from Florida to Cuba.
Nyad says she was 8 years old when she first dreamed about the possibility of swimming across the Straits of Florida.
In the 1970s, Nyad won multiple swimming marathons and was one of the first women to encircle the island of Manhattan.
But 30 years after she took her last stroke, on her 60th birthday, Nyad began to swim against a new current: age.
But Nyad's biggest success came only after her biggest, most public failure.
Nyad said her navigator assured her that the seas calmed down almost to the serenity of a skating pond just a few miles out.
CNN: Diana Nyad making fourth attempt at Cuba-to-Florida swim
She began the swim a day early because the water seemed to be "fantastic, " Nyad said at a news conference before beginning the swim.
On her first attempt in August, an 11-hour asthma attack and shoulder pain forced Nyad out of the water about 29 hours into her swim.
CNN: Diana Nyad making fourth attempt at Cuba-to-Florida swim
Nyad's first attempt to cross the Straits of Florida was in 1978, when rocky seas left her battered, delirious and less than halfway toward her goal.
Dr. Ken Kamler, a microsurgeon and expert on practicing medicine under extreme conditions, says that as Nyad swims, her body will first turn to glucose for energy.
Nyad's marathon swimming career began in July 1970, when she set the women's world record for the 10-mile swim across Lake Ontario: four hours and 22 minutes.
In what she now realizes was an ironic moment, Nyad says, she looked into the rearview mirror in her car and decided that might not be entirely true.
Forty-one hours and 49 minutes later, Nyad's team pulled her out of the sea -- battered, delirious, ravaged by jellyfish, and only 50 miles from where she had started.
CNN: Diana Nyad making fourth attempt at Cuba-to-Florida swim
"I used to stand on the beach and I said to my mother, 'I wonder if anybody could swim over there, " Nyad recalled saying, while pointing to the Keys.
This Sunday, for the third time in a year, Nyad will take to the seas -- departing from Havana, Cuba's, Hemingway Marina on a quest to swim for the Florida shore.
CNN: Diana Nyad making fourth attempt at Cuba-to-Florida swim
The 62-year-old Nyad -- who completed her Lake Ontario swim in 1974 at the age of 24 -- was a third of the way to her goal as of Sunday evening.
Speaking of sharks, Nyad is attempting the swim without a physical shark cage, and she is relying on an electronic shark repellent device and a team of divers to keep them away.
CNN: Diana Nyad making fourth attempt at Cuba-to-Florida swim
Nyad's team of more than 30 people consists of about 10 handlers, who will take turns minding Nyad's every move for the estimated 60 hours it will take her to complete this swim.
Last year, Nyad twice met a similar fate.
CNN: Diana Nyad making fourth attempt at Cuba-to-Florida swim
Six ocean kayakers will switch off paddling kayaks mere inches from Nyad's side throughout the journey, towing underneath them electronic Shark Shields that emit a harmless but annoying electrical impulse that repels most species of sharks.
After 41 hours and 49 minutes in the water, Nyad's handlers gave her the bad news: Because of high waves and strong currents, she was so far off course that completing the swim would be impossible.
In the 1970s, Nyad was unstoppable.
CNN: Diana Nyad making fourth attempt at Cuba-to-Florida swim
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