Spring Is Here
Spring lines’ length and height must also be factored from trial and error. Too long and your boat will bang the dock when current or wind is astern; too short and you’ll have to make a leap to board during high tide. Experiment through several tides.
Lines looped over cleats can become too tight to untie during astronomically low and high tides. Use cleat hitches and you’ll always be able to untie. Leave a few feet of tag end to adjust for extremes in water level caused by weather events.