When you're floating in the water, only your head and shoulders are above the surface. This is an important consideration when using a ladder to re-board your boat. If the ladder doesn't extend deep enough into the water, you may have to bring your leg up to your chest just to get on that first rung. As a result, it is very important to choose a ladder that will extend two or three rungs below the water’s surface (about 2 - 3 feet).
To determine the overall height of the ladder you need, measure the height of the free board on your boat and then add an extra 2 to 3 feet for ladder submersion. For mounted ladders, also take into consideration where the ladder will be mounted on your boat. You’ll need to allow for proper ladder submersion, while also mounting high enough up the free board in order to make re-boarding easy.
Pro Tip: If re-boarding from the side of your boat, choose a ladder with standoffs that rest against the hull. This adds rigidity and stability to the boat ladder. Ladders without standoffs in a side-boarding situation can flex and float underneath the boat, making them difficult to climb.