Builder sheets and type pages use short labels for length, width, depth, and hull shape. This page translates the ones that show up most when you compare new recreational boats in the U.S.
Use it when a number or word on a spec sheet does not match what you pictured at the dock. Definitions stay plain. No prices, no carts.
Definition: The full length of the boat from the tip of the bow to the back of the hull, usually including bolted-on platforms that the maker counts in LOA. Check the builder's fine print for whether the swim platform or pulpit is in or out.
Why it matters: LOA drives slip fees, trailer fit, and whether the boat feels crowded. Compare LOA to LOA, not to waterline length.
Definition: The length of the hull where it meets the water when the boat sits at its designed load.
Why it matters: Waterline length affects how the boat moves through the water. Two boats with the same LOA can have different LWLs if one has more overhang.
Definition: The widest point of the boat, usually measured across the hull.
Why it matters: Beam is stability and interior room. A wider beam often means more cockpit or cabin space, and a wider trailer and slip.
Definition: How deep the hull and running gear sit in the water. Often listed as engines up and engines down for outboards.
Why it matters: Draft decides what water you can enter. Shallow draft helps skinny lakes and flats. Deeper draft can help tracking and rough water, and can strand you at the ramp or sandbar.
Definition: The height of the hull side from the waterline up to the gunwale or deck edge.
Why it matters: Higher freeboard throws spray and waves off the deck. It also makes boarding from a dock or the water harder for some people.
Definition: How deep the open deck sits below the gunwale or coaming, where people stand and fish.
Why it matters: Deeper cockpits feel safer when the boat rolls. Shallower cockpits make it easier to reach over the side for fishing or dock lines.
Definition: The height from the waterline to the highest fixed point on the boat (arch, hardtop, radar, outriggers if fixed).
Why it matters: Trailerable boats still meet bridges, trees, and garage doors. Check clearance before a route with low bridges or a tall top.
Definition: An imaginary line from bow to stern down the middle of the boat.
Why it matters: Specs and layouts are often described left and right of centerline. Console and table placement hang on it.
Definition: The main body of the boat that sits in the water and carries the structure above it.
Why it matters: Hull shape drives ride, draft, and how the boat takes a wave. Type pages group boats by hull job first.
Definition: The V angle of the bottom at a cross-section, often quoted at the transom in degrees. Higher deadrise means a sharper V.
Why it matters: More deadrise usually softens a choppy ride and can need more power to get on plane. Lower deadrise often feels more stable at rest and in skinny water.
Definition: The corner where the bottom of the hull meets the side. A hard chine is a sharp corner. A soft chine is a rounded transition.
Why it matters: Hard chines add stability when you are stopped or drifting. Soft chines can feel smoother when the boat rolls.
Definition: A hull bottom that curves into the sides without a sharp chine corner. Sometimes called a non-chine or round-bilge hull.
Why it matters: Common on some displacement and sail-derived shapes. Expect a different roll feel than a hard-chine powerboat of the same beam.
Definition: The curve of the deck line from bow to stern when you look at the boat from the side.
Why it matters: Sheer is mostly style and spray behavior. A high bow sheer can keep the foredeck drier.
Definition: The flat or nearly flat back wall of the hull where outboards usually mount.
Why it matters: Transom height and width affect engine fit, splashwells, and how following seas board the boat.
Definition: A displacement hull moves through the water at speeds tied to its waterline length. A planing hull rises and skims across the surface once it has enough speed and power.
Why it matters: Most trailerable fishing and runabout types are planing designs. Displacement boats cruise slower and often roll differently. Match the hull type to how you actually run the boat.
Definition: The walking surface above the hull: cockpit sole, foredeck, side decks, and cabin top as fitted.
Why it matters: Deck layout decides where you stand, store gear, and move when the boat is underway.
Definition: The upper edge of the hull side where the deck and topsides meet. "Gunnel" is the same word said out loud; most sheets print gunwale.
Why it matters: Gunwale height ties to cockpit depth and how you lean out to boat a fish or step aboard.
Definition: The lowest inside area of the hull where water collects. Also used for the pumps and space under the sole.
Why it matters: You want bilge pumps that work and a bilge you can inspect. Standing water under the sole is a red flag on any boat.
Definition: Longitudinal supports inside the hull that stiffen the bottom and carry loads from engines, tanks, and decks.
Why it matters: Strong stringers matter for durability. Buyers rarely see them on a new sheet, but the word shows up in build talk and surveys.
Definition: An enclosed space with shelter, often with berths, a head, or a small galley depending on the type.
Why it matters: Cabin size trades against cockpit space. Decide whether overnight shelter or open deck matters more for how you boat.
Definition: The raised helm station that holds the wheel, controls, and often electronics. Center consoles put it in the middle of the boat.
Why it matters: Console size and placement change walkaround space and weather protection. Compare console footprint when two boats share a length.