Jacklines and tethers are used anytime you leave the companionway.
I like U bolts in the cockpit corners.
I do not have individual tethers; rather they are attached to the jacklines and U bolts. As you move around you attach the new one BEFORE releasing the old one.
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IYT Yachtmaster Coastal Instructor
As I sail, I praise God, and care not. (Luke Foxe)