In the picture we see a variety of hook shapes, but for the purpose of this article we will only discuss two, the circular profile on the left and the flat profile on the right.

• Circular - The circular profile is much simplar and does not snag as often as the flat profile. In addition, if the hook has a breaking strain of x, then that is true regardless of where the load comes from. The disadvantage of this shape is to do with the catch. When the hook is under load, the catch is locked in place.
• Flat - This profile can catch under a life line. In addition, if a force is applied on the side of the hook, then the hook can twist and fail at a crucial moment. The advantage is to do with the catch which is designed in such a way that even under load, you can unclip the hook

There are two types of tethers, the straight tether and the Y shaped tether

• Straight tether - Simple tether for when you are standing at the wheel or sitting in the cockpit
• Y-Shape - This tether is great for going forward as you can keep one hook on the lifeline while you move the other hook to a hard point. When you are attached to the hard point you can remove the hook on the lifeline.

Having the two different shapes on board is a great idea, as the straight tether works really well in the cockpit area, but if you had to choose just one, then choose the Y-shaped tether as that is safer going forward

The lifeline should run down the side of your boat, so that you can move down the boat. Do not rely only on the life line, by making sure you also have a hand on the boat

A lot of people remove the lifelines when they are in port, because they gather dirt under them. If this is your policy, make sure that lifelines are on your checklist for going out to sea.

The main thing that you have to consider with lifelines is strength. They have to be strong enough to keep you onboard.

A hard point is a location that you can attach a tether to. You need hard points in the cockpit area for the person at the wheel or tiller, as well as a for the crew. You will also need a hard point at the mast.