The phone rings with an incoming WhatsApp call from Stuart Bannatyne. I’m at my desk at Google, so I jog to a conference room to have a private conversation. Bannatyne, from Doyle Sails, is a legend ...

There is an old sail trim adage, “trim the front of the jib and back of the mainsail,” or where the wind meets and leaves the sail plan. Telltales are a key tool helping you figure out what is going ...