#marine

Marine- und Surfvorhersagen als API, powered by Open-Meteo — sauberes JSON, kein API-Key. Rufen Sie den aktuellen Meereszustand sowie die stündliche und tägliche Wellenvorhersage für jede Küstenlinie per Breitengrad/Längengrad oder einfach per Ortsnamen ab: signifikante Wellenhöhe, Periode und Richtung, plus die Dünungs- und Windwellenkomponenten separat ausgewiesen, sowie tägliche Maxima und Hauptrichtungen. Ein integrierter Geocoding-Helfer wandelt einen Ortsnamen in Koordinaten um. Vorhersagen laufen bis zu zehn Tage im Voraus. Live-Vorhersagedaten direkt aus dem marinen Modell von Open-Meteo. Ideal für Surf-Report-Apps, Segel- und Bootstools, Küsten- und Meeresbetriebs-Dashboards sowie Strand-Widgets. 4 Datenendpunkte. Authentifiziert mit einem x-oanor-key; Fair-Use-Ratenlimits pro Plan.

api.oanor.com/marine-api

Sea-horizon and visibility maths as an API, computed locally and deterministically — the distance-to-horizon, geographic-range and dip numbers a mariner, coastal navigator or marine app works sightings with. The horizon endpoint gives the distance to the sea horizon ≈ 1.169·√(height of eye in feet) nautical miles, including the standard atmospheric refraction that bends the line of sight a little past the geometric edge — at 9 ft of eye height the horizon is about 3.5 nm off — together with the dip, how far below true horizontal that watery edge lies (≈ 0.97′·√h), the correction subtracted from a sextant altitude shot to the sea horizon. The geographic-range endpoint gives how far off a light or landmark first peeps over the horizon = the sum of two horizon distances, your own plus the object's: 1.169·(√h_eye + √h_object), so a 100 ft lighthouse from a 9 ft cockpit lifts above the sea at about 15 nm — purely geometric, before the light's own luminous range and the visibility. The object-height endpoint inverts it: how tall a tower, light or headland must stand to break the horizon at a target range, or how close you must be before a known landmark appears. Everything is computed locally and deterministically, so it is instant and private. Ideal for marine-navigation and chartplotter apps, coastal-pilotage and lighthouse tools, and sailing utilities. Pure local computation — no key, no third-party service, instant. Geometric/refraction model. 3 compute endpoints. For great-circle distance use a geo-distance API; for set & drift a set-and-drift API.

api.oanor.com/horizon-api

Current-sailing (set and drift) navigation maths as an API, computed locally and deterministically — the course-over-ground, course-to-steer and current numbers a mariner, navigator or marine app plots a passage with. The course-made-good endpoint adds the boat's velocity through the water to the current vector to give the real track: the course over ground (COG) and speed over ground (SOG), with the drift angle the current pushes you off your nose — steering 090° through the water at 10 knots with a 2-knot current setting north comes out around 079° over the ground at 10.2 knots. The course-to-steer endpoint solves the other way: the heading to steer to make good a desired ground track, steering up-current to cancel the across-track set (sin(H−T) = −drift·sin(set−track) ÷ speed), and the resulting SOG — usually slower into a current, faster with it astern, and impossible if the current across the track beats your speed. The current endpoint finds the set and drift from the offset between a dead-reckoning position and an observed fix: the set is the bearing DR-to-fix and the drift is that distance ÷ the elapsed time, ready to carry forward. Everything is computed locally and deterministically, so it is instant and private. Ideal for marine-navigation and chartplotter apps, sailing and boating tools, and maritime-training utilities. Pure local computation — no key, no third-party service, instant. Degrees true. 3 compute endpoints. For great-circle distance use a geo-distance API; for tide times a tides API.

api.oanor.com/setanddrift-api

Seawater oceanography maths as an API, computed locally and deterministically from the standard equations — the density, freezing-point and chlorinity numbers an oceanographer, marine scientist or aquarist works with. The density endpoint gives the seawater density and σt from salinity and temperature using the full UNESCO EOS-80 one-atmosphere equation of state — it reproduces the official check value of 1027.675 kg/m³ at 35 PSU and 5 °C exactly — around 1,025 kg/m³, rising with salinity and falling with temperature, the two drivers of the ocean's density-driven circulation where cold salty water sinks. The freezing-point endpoint gives the freezing point from salinity (Millero): about −1.9 °C at the ocean's typical 35 ppt, and because salt also pushes the temperature of maximum density below freezing, seawater keeps overturning and cooling all the way down instead of stratifying like a freshwater lake — why the open ocean rarely freezes outside the polar seas. The chlorinity endpoint converts between salinity and chlorinity through the Knudsen relation S = 1.80655 × Cl, the classic titration measure that the constant major-ion proportions of seawater make reliable. Everything is computed locally and deterministically, so it is instant and private. Ideal for oceanography and marine-science tools, ocean-model and sensor pipelines, aquarium and aquaculture apps, and environmental dashboards. Pure local computation — no key, no third-party service, instant. Surface (atmospheric-pressure) forms. 3 compute endpoints. For the speed of sound in seawater use a sonar API; for general colligative properties a colligative-properties API.

api.oanor.com/seawater-api

Unterwasserschall- und Sonar-Mathematik als API, lokal und deterministisch berechnet – die Geschwindigkeits-, Absorptions- und Entfernungszahlen, mit denen ein Schiffsingenieur, Sonarentwickler oder Ozeanograph arbeitet. Der Schallgeschwindigkeits-Endpunkt liefert die Schallgeschwindigkeit im Meerwasser aus der Mackenzie-Neun-Term-Gleichung: etwa 1.500 m/s – weit schneller als in Luft – steigend mit Temperatur, Salzgehalt und Tiefe, sodass ein Profil von 25 °C, 35 ppt bei 1.000 m 1.550,7 m/s ergibt. Da die Geschwindigkeit mit der Tiefe variiert, biegen sich Schallstrahlen und bilden den SOFAR-Kanal, der Walgesänge und Signale über ganze Ozeane trägt. Der Absorptions-Endpunkt liefert Thorp's Schallabsorptionskoeffizienten in dB pro km gegen die Frequenz, mit dem Verlust über eine Strecke: Meerwasser verschluckt hohe Frequenzen schnell, weshalb Langstreckensonar und Walrufe tief sind, während hochfrequentes Sonar nur auf kurze Distanz scharfe Bilder liefert. Der Echo-Entfernungs-Endpunkt wandelt die Zwei-Wege-Laufzeit eines Echolots oder Sonars in die Entfernung oder Tiefe um – Distanz = Schallgeschwindigkeit × Zeit ÷ 2 – sodass ein Ein-Sekunden-Rundweg bei 1.500 m/s ein Ziel 750 m entfernt ergibt, dessen Genauigkeit auf der angenommenen Schallgeschwindigkeit beruht. Alles wird lokal und deterministisch berechnet, also sofort und privat. Ideal für Sonar- und Hydrophon-Werkzeuge, Vermessungs- und Bathymetrie-Apps, ozeanakustische Forschung und AUV/ROV-Navigationshilfen. Reine lokale Berechnung – kein Key, kein Drittanbieter-Service, sofort. Standardgleichungsschätzungen über ihre gültigen Bereiche. 3 Compute-Endpunkte. Für die Schallgeschwindigkeit in Luft und Mach verwenden Sie eine Mach-Zahl-API; für Dezibel eine Schallpegel-API.

api.oanor.com/sonar-api

Ship initial-stability maths as an API, computed locally and deterministically — the metacentric-height, righting-moment and rolling-period numbers a naval architect, ship officer or marine-surveyor judges a vessel by. The metacentric-height endpoint gives GM = KM − KG, the single most important stability figure: the height of the metacentre (set by the hull form and draught) above the centre of gravity (set by how the ship is loaded), with a classification from a dangerous negative GM, through tender and comfortable, to a stiff GM that rolls violently — naval architects aim for the middle, because too little is unsafe and too much is hard on cargo and crew. The righting-moment endpoint gives the small-angle righting arm GZ ≈ GM · sin(heel) and the righting moment (GZ × displacement) that pushes the ship back upright, valid up to roughly 7–10° before the true GZ curve bends away. The roll-period endpoint gives the natural transverse rolling period T = 2π·k / √(g·GM) from the GM and beam — the same relation sailors run in reverse as the rolling-period test, where a suddenly longer roll warns that GM has dropped. Everything is computed locally and deterministically, so it is instant and private. Ideal for naval-architecture and ship-design tools, marine-surveyor and loading-software utilities, maritime-training apps and stability dashboards. Pure local computation — no key, no third-party service, instant. Initial-stability estimates — use full KN cross-curves for large angles. 3 compute endpoints. For hull speed and design ratios use a sailing API.

api.oanor.com/shipstability-api

Bootspropeller-Mathematik als API, lokal und deterministisch berechnet – die Schlupf-, Drehzahl- und Steigungszahlen, die entscheiden, ob ein Boot seine Werte erreicht oder kämpft. Der Slip-Endpunkt gibt den Propellerschlupf aus Steigung, Propeller-Drehzahl und tatsächlicher Bootsgeschwindigkeit: theoretische Geschwindigkeit = Steigung × Propeller-Drehzahl ÷ 1215, und Schlupf = (theoretisch − tatsächlich) ÷ theoretisch – ein 19-Zoll-Propeller bei 2000 U/min sollte theoretisch 31 Knoten machen, also sind echte 26,6 Knoten etwa 15 % Schlupf, normal für ein sauberes Gleitboot. Der Prop-RPM-Endpunkt gibt die Propeller-Drehzahl aus Motordrehzahl und Getriebeuntersetzung – ein 2:1-Getriebe dreht den Propeller mit halber Motordrehzahl – und mit einer Steigung die theoretische schlupffreie Geschwindigkeit bei dieser Drehzahl. Der Pitch-Endpunkt gibt die Steigung, die benötigt wird, um eine Zielgeschwindigkeit bei einer Propeller-Drehzahl und erwartetem Schlupf zu erreichen: Steigung = Ziel × 1215 ÷ (Propeller-Drehzahl × (1 − Schlupf)), sodass Sie das Boot so bestücken können, dass der Motor den oberen Bereich seiner Volllast-Drehzahl erreicht, anstatt zu quälen. Alles wird lokal und deterministisch berechnet, also sofort und privat. Ideal für Boots- und Marine-Apps, Repowering- und Propeller-Shop-Tools, Leistungsrechner und seemännische Studienhilfen. Reine lokale Berechnung – kein Key, kein Drittanbieter-Service, sofort. Live, nichts gespeichert. 3 Compute-Endpunkte. Schätzungen – Rumpf, Beladung und Untergrundzustand verschieben den tatsächlichen Schlupf.

api.oanor.com/propeller-api

Boat-anchoring maths as an API, computed locally and deterministically — the scope, swing and load numbers a sailor or boater sets the hook by. The scope endpoint gives the rode to let out: scope = rode ÷ the vertical from the seabed to the bow roller (water depth + bow height), measured at high tide, so anchoring in 20 feet with a 4-foot bow at the classic 7:1 means paying out 168 feet of rode — let out more in a blow, and never less than 5:1 on all chain. The swing endpoint gives the circle the boat swings on: radius = the horizontal reach of the rode (√(rode² − vertical²)) plus the boat length, so that 168-foot rode on a 30-foot boat sweeps a 196-foot radius — the room you must leave every other boat, which swings too. The load endpoint gives the wind load the ground tackle has to hold, 0.00256 × drag coefficient × frontal windage area × wind speed², which quadruples every time the wind doubles — 50 square feet of windage takes 138 lb at 30 mph but 553 lb at 60. Everything is computed locally and deterministically, so it is instant and private. Ideal for sailing and boating apps, anchoring and cruising tools, ground-tackle sizing calculators, and seamanship study aids. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. Estimates — add current, waves and a safety margin.

api.oanor.com/anchor-api

Sailing and naval-architecture maths as an API, computed locally and deterministically — the hull-speed and design-ratio numbers a sailor, boat-shopper or yacht designer sizes a boat with. The hullspeed endpoint gives the theoretical displacement speed limit from the waterline: hull speed = 1.34 × √LWL (feet) in knots, so a 25-foot waterline tops out around 6.7 knots (7.7 mph, 12.4 km/h) — with a tunable coefficient up to about 1.5 for light, easily-driven hulls, since planing boats leave the formula behind entirely. The ratios endpoint computes the two classic performance numbers: the Sail Area/Displacement ratio, SA/D = sail area ÷ (displaced volume in ft³)^⅔ using displaced volume = displacement ÷ 64 lb/ft³ for seawater — around 16–18 is a typical cruiser and 20-plus is sporty — and the Displacement/Length ratio, DLR = (displacement in long tons) ÷ (0.01 × LWL)³, where under 200 is light and over 300 is heavy, each returned with a class label. The ballast endpoint gives the ballast ratio = ballast ÷ displacement × 100, a rough proxy for stiffness and sail-carrying power that most cruisers hit near 35–45 %. Everything is computed locally and deterministically, so it is instant and private. Ideal for sailing, boating, marine, yacht-brokerage and boat-design app developers, boat-comparison and rig-sizing tools, and naval-architecture calculators. Pure local computation — no key, no third-party service, instant. Imperial units. Live, nothing stored. 3 compute endpoints. Design-ratio estimates, not a velocity prediction program.

api.oanor.com/sailing-api

La escala de viento Beaufort como API, calculada local y determinísticamente. El endpoint classify convierte una velocidad de viento medida — en metros por segundo, kilómetros por hora, nudos, millas por hora o pies por segundo — en su fuerza Beaufort (0 calma a 12 huracán), con el nombre descriptivo (brisa ligera, vendaval, tormenta…), el estado del mar correspondiente y la altura media de las olas en mar abierto, además de la velocidad expresada en cada unidad. El endpoint force busca un número Beaufort y devuelve su rango de velocidad de viento en todas las unidades, su descripción, condición del mar y altura de las olas. El endpoint convert convierte una velocidad de viento entre metros por segundo, kilómetros por hora, nudos, millas por hora y pies por segundo e informa la fuerza Beaufort coincidente (1 nudo = 0.514444 m/s). Las velocidades usan la altura de referencia estándar de 10 metros y las alturas de olas son medias en mar abierto. Todo se calcula local y determinísticamente, por lo que es instantáneo y privado. Ideal para desarrolladores de aplicaciones de navegación, marina, aviación, drones, clima y exteriores, herramientas de advertencia de viento y estado del mar, y educación en meteorología. Cálculo local puro — sin clave, sin servicio de terceros, instantáneo. En vivo, nada almacenado. 3 endpoints. Esta es la escala de viento Beaufort; para la sensación térmica por viento use una API de sensación térmica y para observaciones de viento en vivo una API de datos meteorológicos.

api.oanor.com/beaufort-api

Matemáticas de flotabilidad y flotación de Arquímedes como una API, calculadas local y determinísticamente. El endpoint de flotabilidad calcula la fuerza de flotación sobre un cuerpo sumergido o flotante, Fb = ρ_fluido·g·V_desplazado — el empuje hacia arriba es igual al peso del fluido desplazado — a partir de un volumen desplazado y un fluido (agua, agua de mar, aceite, mercurio y más, o una densidad personalizada), y también da la masa del fluido desplazado; resuelve el volumen a partir de una fuerza conocida también. El endpoint de flotación decide si un objeto flota, se hunde o es neutro comparando su densidad (dada directamente, de un material incorporado, o como masa dividida por volumen) con la densidad del fluido, y para un objeto flotante devuelve la fracción sumergida f = ρ_objeto/ρ_fluido (así que el 90 % de un iceberg está bajo la línea de flotación), o para un objeto que se hunde su peso aparente (bajo el agua). El endpoint de carga dimensiona la flotación: el volumen desplazado necesario para flotar una carga dada, V = W/(ρ_fluido·g), o la carga máxima adicional que un cuerpo flotante de un volumen y densidad dados puede llevar antes de sumergirse, Wmax = (ρ_fluido − ρ_cuerpo)·V·g. Todo se calcula local y determinísticamente, por lo que es instantáneo y privado. Ideal para herramientas de arquitectura naval y marinas, buceo, aplicaciones de ROV y lastre, diseño de balsas y pontones, y educación en física. Cálculo puramente local — sin clave, sin servicio de terceros, instantáneo. En vivo, nada almacenado. 3 endpoints. Esto es flotabilidad y flotación; para presión a profundidad y fuerza hidrostática en una pared, use una API de hidrostática.

api.oanor.com/buoyancy-api

Condiciones meteorológicas y oceánicas marinas en vivo del Centro Nacional de Datos de Boyas (NDBC) de la NOAA. El catálogo de estaciones (1.930 boyas amarradas y estaciones costeras en todo el mundo) se puede buscar por nombre, tipo o coordenada; el endpoint en vivo devuelve la última observación de cualquier estación: altura significativa de ola, período y dirección de ola, temperatura del agua y del aire, velocidad del viento/rachas/dirección, presión atmosférica y más. Encuentra las boyas más cercanas a cualquier latitud/longitud. Ideal para aplicaciones de surf y navegación, operaciones marinas, monitoreo costero y oceanografía.

api.oanor.com/buoys-api

Previsões de maré alta e baixa para milhares de estações costeiras dos EUA, fornecidas pela NOAA CO-OPS. Pesquise o diretório de estações por estado ou nome, obtenha metadados completos da estação (coordenadas e fuso horário) e receba previsões de maré como eventos de maré alta/baixa ou uma série horária de alturas por até sete dias, em pés ou metros e contra o datum de sua escolha (MLLW, MSL, MHHW e mais). Entregue através de uma API rápida e confiável com erros claros para estações inválidas. Ideal para navegação e vela, pesca e surfe, portos e logística, serviços de praia e turismo e planejamento costeiro.

api.oanor.com/tides-api

Real-time and forecast ocean conditions for any coastal or open-water location. Get the current sea-surface temperature (in °C and °F) together with a wave snapshot — height, direction, period, swell and wind-wave — pull an hourly series of temperature and waves, or a daily forecast with sea-temperature min/avg/max and wave aggregates. Global ocean coverage sourced from Open-Meteo’s Marine model, delivered through a fast, reliable API; inland coordinates return a clear not-found so you always know you have ocean data. Ideal for surf and sailing apps, fishing and diving, beach and tourism services, shipping and coastal or climate monitoring.

api.oanor.com/seatemp-api

Real-time weather: current conditions, multi-day forecast, historical weather, marine/wave forecast, astronomy (sun/UV), air quality, geocoding and timezone.

api.oanor.com/weather-api