What is the difference between a port light and a port hole?

Have you ever wondered what the difference is between a porthole and a portlight? Captain Steve explains the difference and how to tell upon first look.

Bay Lights Charters very own Captain Steve explores the Nautical Lore describing a “port light” and a “port hole”. When we talk about a port light, we are not talking about light with a light bulb or the port-side running light on the left side of the vessel. A “port light” is a square window on the exterior of the vessel. A square, or rectangular window on a vessel is called a port light. It can be opened or a fixed window. It usually has tempered glass for strength. A port light is not usually found low on the hull where it is subject to high seas striking the vessel.

A “port hole” on the other hand, is a round window, usually a little smaller than a port light. The main difference between the two is that a port hole is usually found lower on the hull or superstructure of the vessel. Port holes are usually designed to be installed in more critically watertight areas where it can be sealed off and has a sturdy plate on the inside and outside for storm seas. Because of its round shape, it has inherently more strength and resistance to wave action.

Come join us on Gas Light, we would LOVE to sail with you on San Francisco Bay.