The father and daughter team, Tony and Charlotte, driving the "Red Steel" sponsored boat in the Sports 200 class, are currently leading in the championship points after three rounds with 2650 points.
Mrs Carson said it was often a challenge to make sure she didn't cheer for one family member's boat beating another.
She said she didn't want to upset family relations and might have to cut her T-shirt into pieces.
Although a highly dangerous discipline, Mrs Carson has total faith in her family and their crew.
"I trust what they have been taught," she said.
Experienced helicopter pilots, Coastguard patrol boats and doctors will ensure the safety of the event.
This year also had a bit of an international flavour with Australian duo "222 Offshore" Darren Nicholson and Peter McGrath lining up with the Kiwi super boat teams.
"222 Offshore" arrived into New Zealand early January to compete in the Anzac Trans-Tasman Cup over four rounds and the New Zealand Championship Series which is held over seven rounds. The first three rounds included the Anzac Cup, with the final round being in Auckland on April 30.
The one-hour Napier race starts at 1pm.
A line-up of 20-25 boats are expected this weekend with several other classes - sports 225, sports 200 and classic class.
Some are going to be displayed around town, and all will be launched at the sailing club from about 10am today, some by crane.
Among them is Australian catamaran 222 Offshore Racing, an Australian boat which has an amazing mobile workshop and brings a crew and service crew of up to 12 people.
