The ORCA Sailing Processor: (PART 2) A Deep Dive into True Wind Magic
In my recent post about our ORCA setup , I promised a proper technical deep-dive into how this system actually works. Well, buckle up (and this is coming sooner than I thought) – we're going down the rabbit hole of sailing physics, sensor fusion, and why getting accurate wind data is both harder and more important than most sailors realize. The "True Wind" Problem Here's the thing that tripped me up early in my career at Magellan GPS: calculating true wind sounds simple, right? You've got a wind sensor on your mast, you've got boat speed and heading – just do some vector math and you're done. Well, no. It's that 'devil in the details' thing. It turns out the wind sensor on your mast top is basically not telling you the truth. Not on purpose, but it's being influenced by so many physical phenomena that the "measured wind" it's reporting bears only a passing resemblance to the actual wind your sails are experiencing. And wh...