In Canada, the government-required equipment for sea kayaks includes “a buoyant heaving line at least 15 meters long”. In other words, a rescue throwline. I’ve always suspected this requirement was drafted by some well-meaning but ill-informed civil servant who didn’t understand the differences between river and ocean kayaking. Because when I did whitewater paddling, I used my throwline more than once to fish out a buddy who’d had to abandon boat and was being recirculated in a feature that was loathe to spit him out. But I did that from the security of a riverbank. In sea kayaking, if your companion is in the soup, you likely are also. There’s rarely land or a patch of calm water from which to pitch a line. If you’re going to tow someone, it’s usually easier to paddle over and clip in your towline.* In more than three decades of sea kayaking, I’ve used my towline/throwline as a rescue throwline exactly once. And it wasn’t to save a kayaker.