There are nearly nine billion people on Earth, and not one of them is identical to another. Three-quarters of the planet is covered with water, which can be whipped into waves, ripples, or tsunamis—and neither are any of those identical to the others, nor predictable.
You and your boat respond to unpredictable waves and weather categorically: with hatches down, sail shortened, eggs in the galley secured. But you must be prepared to respond momentarily, too. You cannot predict the ever-changing action of the coming waves because they are packets of energy; their dynamics interact constantly to amplify, decrease, nullify. One wave is not like the next wave. There will come a time when the foredeck will require attention for reasons you cannot now predict. The security of your first step out of the cockpit, and the steps that follow, will change momentarily. Secure yourself in the moment.
How can you secure yourself and still move? In stages, along jacklines strategically strung fore-and-aft, moving from one affixed section to another with two tethers working in tandem.