# Twelve invented boxes describe a sea with no edges > The open sea has no straight lines in it anywhere. A shipping forecast map draws twelve anyway, because a list read aloud needs fixed boundaries and the sea doesn't provide any. August 19, 2026 · https://justog.club/stories/shipping-forecast-areas A navy map in cream. No coastline, no land shading, nothing but straight ruled lines carving open water into twelve named boxes — FASTNET REACH, DOGGER SHOAL, MALIN DEEP, LUNDY GATE, ROCKALL EDGE, BAILEY SOUND, HEBRID BANK, FORTIES RUN, TYNE MOUTH, HUMBER FLAT, THAMES BAR, PLYMOUTH ROADS. The sea doesn't have corners. This map is confident that it does. ## What are these twelve boxes, and why does the sea look like it's been ruled with a straight edge? Because the boundaries aren't a description of the water — they're a filing system built on top of it. A shipping forecast has to be read aloud, in order, to somebody who can't see a chart and might not be able to see anything at all. Twelve fixed areas with names and a fixed sequence solve that problem: a listener learns the order once and can then place any area mentioned relative to the ones either side of it, without ever needing the coastline that isn't there. The straight edges are administrative, not oceanographic, and that's exactly the feature. ## Why does drawing invented rectangles over real water actually work? Because the areas only have to be consistent, not accurate to the seabed. A boundary that runs perfectly straight for a long distance isn't marking a ridge or a current — it's marking the edge of somebody's jurisdiction to broadcast about, agreed once and then never redrawn. The sea inside FASTNET REACH doesn't know it's been named that. What matters is that everybody using the forecast draws the same box in the same place, every time, so a warning issued for one area means the same patch of water to every listener at once — the same trust a printed [tide table asks for years in advance](/stories/tide-table-page) when it predicts a height nobody has measured yet. ## What's the actual judgement call in choosing which area to put on a shirt? Whether to pick one area alone or show the full ring of twelve. A single named box with nothing around it reads as a fragment — accurate, but missing the thing that makes the format work, which is its place in a sequence. The full ring shown here is a design choice about completeness: this is not a map of one sea area, it's a map of the entire method for describing a coastline you can't see. ## Can a real shipping forecast's actual area names go on a shirt? The area system as a method belongs to nobody. A specific broadcaster's exact area names and their associated identity are a different question. Dividing a coastline into named boxes for broadcast is a technique, not a proprietary work — nobody owns the fact that weather can be read out in a fixed order. A named forecast service's specific area boundaries and on-air branding are theirs if a real broadcast is the point, and licensing that is straightforward. The invented names here — Dogger Shoal, Hebrid Bank, Thames Bar — do the same job without it, and an invented sea is, in a small way, the wearer's own. ## Does a set of sea areas work for something smaller than an ocean? The same logic runs down to any body of water that needs describing to somebody who isn't looking at it — a lake divided into named bays for a rowing club, a stretch of coast broken into surf spots with their own names known only locally. What all of them share is the underlying problem: a listener at a distance from the water needs a name they can hold onto, and the water itself will never volunteer one. [A single plotted weather observation solves a related problem by position instead of by name](/stories/weather-station-observation) — no coastline either, just a fixed layout everyone reads the same way. ## Isn't a set of invented boxes just decoration dressed up as a real forecast? No — the value isn't in whether the names are real, it's in whether the system built from them actually functions. A reader can trace the ring from Fastnet Reach round to Plymouth Roads and understand exactly how a forecast moves through a coastline without a single true name on the shirt. The names carry the sequence; the sequence is the invention worth keeping, whether the labels attached to it are real or made up for this one design. ## Does a sea-area map print well? Yes — flat navy and a small number of cream lines is about as simple as artwork gets, provided the boundaries stay perfectly straight. A boundary drawn with the slightest curve reads as a coastline the map is trying and failing to show, which undercuts the whole point. Keep the twelve names in one consistent size rather than scaling the busier ones down to fit — a crowded label is more honest to the format than a shrunk one, [the same principle a lighthouse's timing diagram runs on when it refuses to compress its own rhythm](/stories/lighthouse-characteristic). ## How do I get one made? Describe your sea at [JustOG](/) — how many areas, what they're called, and which one gets the warning. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped. Designs other people have published are in the [shop](/shop). Somewhere past Plymouth Roads the ruled lines simply stop, because nobody has needed to name what's beyond them yet.