The direction from which the wind is blowing. Sailing upwind means traveling toward the wind source, which requires zigzagging (tacking).
Going upwind is one of the fundamental challenges in any wind sport. No sail-powered craft can travel directly into the wind — there's a "no-go zone" of roughly 40–50 degrees on either side of the wind direction where sails can't generate power.
To travel upwind, you sail at an angle to the wind (called close-hauled or beating), then tack to change sides and sail at an angle on the other side, zigzagging toward your destination. How close to the wind you can sail depends on your craft — racing sailboats can point within 30 degrees, while kitesurfers might only manage 50 degrees.
Foils have revolutionized upwind ability because they eliminate hull drag. The ability to go upwind is what separates a good sailor or kiter from a beginner — without it, you end up downwind of where you started.
Example usage
"Spent the first 20 minutes beating upwind to the reef, then had a glorious downwind ride back."
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