Never had a problem just relying on the tie downs provided by the InterIslander ferries for years of regular sailings now. I tend to attach to the footpegs and one handlebar, usually the high side. That Cook Strait is always calm, just like a mirror to look at all year.
Bluebridge- does anyone know if they provide decent ropes/tie downs? Had to book on the BB for this summer with all the Interislander sailings cancelled. Not used them in many years.
Happiness is a means of travel, not a destination
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