Marina Terms Glossary: 30 Dock and Slip Terms Every Boater Should Know

Walk into any marina office and you will hear a language of its own. Staff talk about beams and drafts, fingers and fairways, transients and liveaboards. For a new boater, or a new dock attendant on their first week, the vocabulary can feel like a wall. This marina terms glossary breaks down the words you will actually hear and use, grouped by where they show up in daily marina life.

We have organized roughly 30 terms into four categories: berthing and measurement, infrastructure and hardware, services, and operations. Each definition is one or two sentences in plain language. If you want a fuller picture of what a marina is and how one runs, start with our guide on what a marina is and come back here when a specific word trips you up.

#Berthing and measurement terms

These are the words that decide where a boat goes and how much that space costs. Get comfortable with them first, because almost every other conversation at a marina builds on them.

• Slip: a parking space for a boat at a dock, usually framed by piers or finger piers on one or both sides. Boats back in or pull in bow first, and the slip is sized by length and width. See our full breakdown of what a boat slip is for the details.
• Berth: a general term for any assigned space where a boat is tied up, whether that is a slip, a spot along a face dock, or a mooring. People often use berth and slip interchangeably, though berth is the broader word.
• Mooring: a fixed anchor system on the seabed connected to a floating buoy, where a boat ties off in open water instead of at a dock. Moorings cost less than slips but require a dinghy to reach shore. Our guide on what a mooring is covers the trade-offs.
• Dockage: the fee a marina charges for keeping a boat in a slip or berth, usually quoted per foot of boat length per night, month, or season. Read more in our explainer on dockage fees.
• LOA: short for length overall, the total length of a boat from the tip of the bow to the back of the stern, including any extensions like a bow pulpit or swim platform. Marinas bill and assign slips by LOA, not the manufacturer's stated model length.
• Beam: the width of a boat at its widest point. Beam determines whether a hull fits between the piers of a given slip, so a wide-beam boat may not fit a slip rated for its length.
• Draft: the vertical distance from the waterline to the lowest point of the hull or keel. Draft tells you the minimum water depth a boat needs to float without grounding, which matters at low tide and in shallow fairways.
• Freeboard: the height of the hull above the waterline, measured from the water up to the deck edge. High freeboard makes boarding from a low dock harder and affects how a boat catches the wind.

#Infrastructure and hardware terms

This group covers the physical structure of the marina: the docks themselves and the fittings that hold boats in place. New staff use these words constantly when directing arrivals or describing a repair.

• Finger pier: a narrow walkway that extends out from the main dock to form one side of a slip, giving you a surface to step onto and tie lines to. Slips with finger piers on both sides are easier to board than those with only one.
• Fairway: the open lane of water between rows of slips that boats travel through to reach their space. A wide fairway makes maneuvering easier, while a tight one demands careful low-speed handling.
• Piling: a heavy vertical post driven into the seabed that supports docks and provides a point to tie off. Pilings often mark the outer corners of a slip and absorb the load when a boat pulls against its lines.
• Cleat: a metal or hardwood fitting, usually shaped like a horn, that lines are wrapped around to secure a boat to the dock or to the boat itself. Knowing how to tie off on a cleat is one of the first skills a dockhand learns.
• Fender: a cushion, often a cylinder or ball of soft material, hung over the side of a boat to protect the hull from rubbing against the dock or another vessel. Fenders are sometimes called bumpers by newcomers.
• Gangway: the ramp or walkway that connects the fixed shore to a floating dock, hinged so it adjusts as the dock rises and falls with the tide. A steep gangway at low tide is a normal sight in areas with a large tidal range.
• Face dock: a long straight section of dock that boats tie up alongside rather than backing into, common for transient arrivals, fuel stops, and larger vessels.

#Service terms

A marina is more than parking. These terms describe the services boaters rely on, from filling the tank to lifting the boat out of the water for the winter.

• Fuel dock: a dedicated dock where boats pull up to take on gasoline or diesel, often with a small store for ice, snacks, and basic supplies. Fuel docks are usually positioned for easy in-and-out access near the marina entrance.
• Pump-out: a station or service that empties a boat's holding tank of sewage into a shore-based system, keeping waste out of the water. Many regions require pump-out use and prohibit discharging holding tanks near shore.
• Shore power: electricity supplied from the dock to a boat through a heavy cable and a dockside pedestal, letting the crew run lights, refrigeration, and air conditioning without the engine or generator. Shore power is usually rated by amperage, with 30-amp and 50-amp the common sizes.
• Haul-out: the process of lifting a boat out of the water for storage, cleaning, painting, or repair, typically using a travel lift or crane. Our guide explains what a haul-out involves and when boats need one.
• Travel lift: a wheeled hoist that straddles a boat, lifts it with wide slings, and carries it from the water to a work or storage yard. It is the workhorse machine behind most haul-outs at boatyards and marinas.
• Dry stack: a storage system where smaller powerboats are stacked on racks inside or under a covered structure and moved in and out of the water by forklift on request. Dry stack protects boats from weather and fouling and is one of several options in our overview of boat storage types.
• Tender: a small boat, often a dinghy, used to ferry people and gear between a moored or anchored vessel and the shore. A tender is essential if you keep your boat on a mooring rather than at a dock.

#Operations terms

The last group shapes how a marina runs day to day: who stays how long, what they pay, and how everyone behaves on the water. These words show up in contracts, signage, and radio chatter.

• Transient: a boat or boater staying for a short period, typically a night or a few days, rather than holding a long-term contract. Transient slips are billed at a higher per-night rate and are often the first to fill in peak season.
• Seasonal: a boater who rents a slip for a full season, often spring through fall, under a single contract at a lower effective rate than transient dockage. Seasonal tenants usually get priority on slip assignment and renewal.
• Liveaboard: a person who lives full time aboard their boat at the dock, which many marinas allow only under a specific permit and at an added fee. Liveaboard rules cover everything from waste handling to mail and parking.
• Transient versus seasonal: the core billing distinction at most marinas, separating short-stay visitors paying nightly from long-term tenants on a season or annual agreement. The split drives how a marina forecasts revenue and manages slip availability.
• No-wake: a zone, usually marked by signs or buoys, where boats must slow to idle speed so they create no wake that could rock moored boats or erode the shore. No-wake zones almost always cover the waters inside and around a marina.
• Pump-out fee: a charge some marinas apply for using the pump-out station, though many offer it free or as part of a slip contract to encourage proper waste disposal.

Once you know these terms, the everyday math of a marina starts to make sense. A boat's LOA and beam decide which slips it fits, the draft decides which fairways it can use at low tide, and the transient or seasonal label decides what it pays. Keeping all of that straight by hand across dozens or hundreds of boats is where the work piles up.

That coordination is exactly what modern marina software handles. Marine OS tracks each slip, the boat assigned to it, its dimensions, and whether the stay is transient or seasonal, so the front desk is not flipping through a paper chart. If you run a marina, our slip management tools and the broader marina solution turn this glossary into a working system. Pricing is flat and simple, starting at $199 a month, and you can compare tiers on the pricing page.

#Frequently asked questions

Keep this glossary handy for your first few weeks around a marina, whether you are docking your own boat or learning the ropes behind the desk. The words become second nature faster than you expect. When you want to dig deeper into a specific topic, follow the links above into our fuller guides, or browse the answers library for more plain-language explanations of how marinas work.