On a day of sunshine and near-perfect wind conditions, the first-timers cast off across the reservoir, accompanied by the club’s qualified instructors.
Club commodore Brian Hoy said: "Over the last three years we have upped our profile by advertising more widely and as a result we have attracted more than 700 people to the event in that time and taken most of those for a sail.
"We organise the date of the open day so that a training course starts soon afterwards. Our members love taking people out sailing and we are always strongly supported by them.
"The Bolton Sea Cadets have joined us this year and they added a new dimension with their very smart appearance and presentation. We are really pleased to host them at the club and look forward to a long association."
Members of the club, near Bolton, Lancashire, were also on hand to answer questions and show visitors round the facilities.
The club offers Sunday racing and cruising, plus regular junior events.
For more information visit www.jumblesail.co.uk