# Nouveau widget - Marées **URL:** \ **Category:** Demandes livrées\ **Created:** [Août 23, 2026, 10:17 UTC](https://community.gladysassistant.com/t/nouveau-widget-marees/10714 "2026-08-23T22:17:25Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Damien](https://gladys-assistant-community.b-cdn.net/user_avatar/community.gladysassistant.com/damien/32/22156_2.png) [@Damien](https://community.gladysassistant.com/u/Damien)\ **Post date:** [Août 23, 2026, 10:17 UTC](https://community.gladysassistant.com/t/nouveau-widget-marees/10714/1 "2026-08-23T22:17:25Z")
Bravo ! Excellente idée ! Pour terminer le sujet météo, un prochain sur les marées ? ---
**Author:** ![Will\_71](https://gladys-assistant-community.b-cdn.net/user_avatar/community.gladysassistant.com/will_71/32/9582_2.png) [@Will\_71](https://community.gladysassistant.com/u/Will_71)\ **Post date:** [Août 23, 2026, 10:28 UTC](https://community.gladysassistant.com/t/nouveau-widget-marees/10714/2 "2026-08-23T22:28:28Z")
Pourquoi pas, je le note. Hésite pas a créer une demande spécifique. ---
**Author:** ![Will\_71](https://gladys-assistant-community.b-cdn.net/user_avatar/community.gladysassistant.com/will_71/32/9582_2.png) [@Will\_71](https://community.gladysassistant.com/u/Will_71)\ **Post date:** [Août 27, 2026, 11:31 UTC](https://community.gladysassistant.com/t/nouveau-widget-marees/10714/3 "2026-08-27T11:31:23Z")
@Damien, Voilà ce que je te propose ![image](https://gladys-assistant-community.b-cdn.net/uploads/default/original/3X/0/3/03d1043829aa8f2b8b8849ed0368532e413d4d24.png) ---
**Author:** ![Will\_71](https://gladys-assistant-community.b-cdn.net/user_avatar/community.gladysassistant.com/will_71/32/9582_2.png) [@Will\_71](https://community.gladysassistant.com/u/Will_71)\ **Post date:** [Août 27, 2026, 9:59 UTC](https://community.gladysassistant.com/t/nouveau-widget-marees/10714/4 "2026-08-27T21:59:43Z")
Voilà la PR > > > What this does > > Adds a tide dashboard widget showing the tides of a house by t…he sea: a harbour tide clock, the next high and low water, the water level right now, and the curve of the day annotated with each tide. A row of tabs steps through the week ahead, one day at a time. On the French coast it also shows the tide coefficient. > > > > How tides are computed > > Tides are predicted locally. The harmonic constituents of the tide station closest to the house are downloaded once from the Open Waters tide database (MIT code, CC-BY-4.0 data, built from the NOAA and TICON-4 datasets) and stored in a per-house variable. Every prediction afterwards is computed offline: the widget keeps working with no network access, and a station that can no longer be downloaded is kept rather than dropped. > > Predictions were checked against the tide tables published by the SHOM for Concarneau: times land within 1 to 4 minutes, heights within about 20 cm. > > Places with no tide to show > > A house inland matches a harbour hundreds of kilometres away, and the Mediterranean or the Baltic move by a few centimetres. Rather than drawing a flat curve, the widget says which of the two it is — the cases are told apart by the distance to the station and by the spring range, and worded differently. > > A third case says the tide could not be retrieved at all: failing to reach the station database says nothing about where the house is, so a seaside house is never told it is inland because the network was down. > > The tide coefficient > > On the French coast the widget shows the tide coefficient, computed on the semi-diurnal constituents alone, the way the SHOM publishes it. Keeping the diurnal ones makes the morning and the evening tide of a same day differ by ten points, which published coefficients never do. Brest harmonics are embedded, so the coefficient needs no second download. > > New dependency > > @neaps/tide-predictor (MIT, ~217 KB unpacked, no transitive dependencies). > > It is an ES module while the server is CommonJS, so it is loaded through a memoized dynamic import() in server/lib/house/house.getTideState.js — the only dynamic import() in the server, which is why docs/specs/tide-widget.md explains it. > > Reimplementing it would be wrong rather than merely tedious: harmonic prediction needs the astronomical equilibrium arguments and the nodal corrections following the 18.6-year lunar cycle. A naive sum of cosines written with the real Saint-Malo constituents lands 2.4 to 6.2 m off across four dates spread over a year (table in the spec). There is no CommonJS equivalent on npm. > > The dynamic import() is safe here: production installs run npm ci --production with no bundler, Node 24 supports it natively, and tests cover it including the offline path. > > API > > One new route: > > GET /api/v1/house/:house\_selector/tide > > Returns the tide state of the house: the tides framing the current moment, the water level, the curve of the day, and the coefficient where it applies. ?day\_offset= selects a day within the week ahead. Returns 400 when the house has no coordinates. > > \## Forum > > Forum: https://community.gladysassistant.com/t/nouveau-widget-marees/10714 > > > \### Checklist > > \- \[x\] Tests pass: \`cd server && npm run coverage\` (Codecov requires 100% coverage on changed lines) and Cypress (\`npm run cypress:run\`) if the UI changed > \- \[x\] Linter and prettier pass on both front and server (\`npm run eslint\`, \`npm run prettier\`) > \- \[x\] No undocumented breaking change > > > \image ---
**Author:** ![cursor-bot](https://gladys-assistant-community.b-cdn.net/user_avatar/community.gladysassistant.com/cursor-bot/32/22252_2.png) [@cursor-bot](https://community.gladysassistant.com/u/cursor-bot)\ **Post date:** [Octobre 29, 2026, 10:49 UTC](https://community.gladysassistant.com/t/nouveau-widget-marees/10714/5 "2026-10-29T10:49:00Z")
Salut @Damien ! Les marées ont une intégration externe : **Marées France** (William-De71, v0.2.0). Pleines mers, basses mers, coefficients, un widget de tableau de bord, et les valeurs utilisables dans une scène. Intégrations → « Marées ». Tu choisis le port dans la configuration. Je range ce sujet dans « Demandes livrées ». S’il reste un cas qui ne correspond pas, ouvre un nouveau sujet : ce sera plus simple à suivre. ---
**Author:** ![cursor-bot](https://gladys-assistant-community.b-cdn.net/user_avatar/community.gladysassistant.com/cursor-bot/32/22252_2.png) [@cursor-bot](https://community.gladysassistant.com/u/cursor-bot)\ **Post date:** [Octobre 29, 2026, 10:49 UTC](https://community.gladysassistant.com/t/nouveau-widget-marees/10714/6 "2026-10-29T10:49:06Z")