Submarius – Global water clarity for divers
Submarius started as just a dashboard for diving conditions, but I quickly realized that there is simply no API for water clarity, nor even a simple way to calculate it. Divers call it viz, and it is one of the most consequential factors for a diving experience. So I dove the viz rabbit-hole. I landed on a state-augmented ensemble kalman filter. More details on the /clarity page. My question for the HN audience is if anyone knows of a better way of doing this? There is a ton of satellite data to train on, but a lot of it is messy (clouds read as turbid water, shallow reefs reflect…
Submarius – Global water clarity for divers launched on June 20, 2026 with 14 votes, #1,036 of 22,647 launches that month and more than 90% of that year's launches.
In plain words
Submarius provides global water clarity data for divers through an API and dashboard. The tool addresses the lack of available visibility forecasting by using satellite data and advanced filtering algorithms to predict "viz" conditions at dive sites worldwide. Water clarity is a critical factor in dive planning, and Submarius aims to fill a gap where no existing solution existed. The maker developed the system using a state-augmented ensemble Kalman filter to process satellite imagery and is seeking feedback on the approach.
written from the facts on this page · September 2026
From the sources
A water clarity forecast, bite score, and conditions verdict for divers, spearfishers, anglers, and boaters, built from public NOAA and satellite data. Free, no signup.
Submarius is a free to start app for iOS, Android and the web that turns public ocean and weather data (NOAA, Open-Meteo, USGS, satellite ocean color) into three things: a water clarity forecast that estimates how far you will see underwater, a 0 to 10 bite score, and a conditions verdict weighted for your activity, with the reasoning behind every number shown. Current conditions, a 2 day forecast, and every safety feature are free, no auth wall. Pro adds the 8 day outlook for $12.99 a month, $99 a year, or $149 once. A dedicated forecast of how far you'll see underwater, something most marine apps don't attempt. Satellite ocean color, in water measurements, river plumes, and wave mixing…from submarius.com
In the maker’s words, at launch
Submarius started as just a dashboard for diving conditions, but I quickly realized that there is simply no API for water clarity, nor even a simple way to calculate it. Divers call it viz, and it is one of the most consequential factors for a diving experience. So I dove the viz rabbit-hole. I landed on a…
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