Emma Wilson and Micky Beckett were among nine British medallists at the Trofeo Princesa Sofia in Mallorca.
The event is the opening regatta of the Los Angeles 2028 Olympic cycle.
Two-time Olympic bronze medallist Wilson lifted the Princess Sofia Trophy, the regatta's main award, after she won 14 out of the 21 races in the foiling windsurfing.
"It's crazy – I wasn't expecting it at all," said the 25-year-old.
"There are names on this trophy like Ben Ainslie, people I've looked up to since I was a kid. To have my name on there now is pretty cool."
Beckett won the men's dinghy fleet for the fourth successive year, and with a day to spare.
There were also gold medals for John Gimson and Anna Burnet - both silver medallists at the Tokyo Games in 2020 - and Freya Black, Saskia Tidey, Martin Wrigley and Bettine Harris.
Great Britain are top of the medal table with Australia in second and China in third place.
"If this week is anything to go by, the future is bright for the British Sailing Team," said performance director Mark Robinson.
Medallists:
Emma Wilson: Gold, iQFOiL
Micky Beckett: Gold, ILCA 7
Saskia Tidey/Freya Black: Gold, 49erFX
Martin Wrigley/Bettine Harris: Gold, 470
John Gimson/Anna Burnet: Gold, Nacra 17
Lily Young: Silver, Formula Kite
Elliot Hanson: Silver, ILCA 7
Ellie Aldridge: Bronze, Formula Kite
Daisy Collingridge: Bronze, ILCA 6
