"We had 25 knots plus and large waves for the last race today ... certainly learning a few things on the job," said Murdoch.
"This is my first international event so a great chance to line up with the rest of the world and see what needs working on.
"I've been here for a few days training and it's great to get racing under way."
New Zealand's new pairing in the Men's 470 of 2012 Olympian helm Paul Snow-Hansen with crew Daniel Willcox sailed strongly on day one for an 11th and a third to finish seventh at the end of day one.
"It was great to line up with some of the best in the world and see how we are going," said Snow-Hansen.
"Race two brought in some awesome breeze, on the upper limit of our racing. We sailed a nice race, nailing the start and keeping upright.
"We had some hairy moments out there but who didn't. We now have two more days of qualifications racing before we are split into gold and silver fleets."
The six-day regatta is the European opener for the ISAF Sailing World Cup Series and a major event for the world's Olympic sailors, and some minor innovations to racing's format and scoring are being trialled by organisers.