The former world and European champion took gold at the EUROSAF Champions Sailing Cup in La Rochelle and admitted it was nice to be back on the water - despite the obvious differences between racing a foiling catamaran in San Francisco and a heavyweight dinghy off the coast of France.
Scott - who was pipped to London 2012 selection by four-time gold medallist Sir Ben Ainslie, despite being reigning world champion - dominated the regatta and took third in the final race to secure a confident win.
"It's good to win, I suppose I could have fobbed it off on something if I hadn't but it's nice not to have to do that," he said.
"It was very shifty, but I knew it would be from the forecast. I had half an eye on the other guys but so many of them and in those conditions you just have to sail your own race.
"I knew fourth or better would do it and I don't think I was lower than third all the way round."
However, there was disappointment for world silver medallists Ben Saxton and Hannah Diamond in the Nacra 17 class, which makes its Olympic debut in Rio. Heading into the final race tied for first they could only manage seventh, dropping off the podium places completely to rank fourth.
Elsewhere, Bryony Shaw made a solid start to the ISAF World Cup regatta in Qingdao.
Shaw won Olympic windsurfing bronze at the venue in 2008 and is the only British sailor in action at the event.
With a big breeze and strong gusts making life tough, the world number one ranks sixth after the opening races.