# Submarius

> The only ocean-conditions app that tells you when to go. Real water-clarity forecasts, honest bite scores, and a single GO/NO verdict per dive day — for spearos, divers, anglers, and boaters.

Submarius aggregates NOAA marine forecasts, Open-Meteo, USGS river-discharge data, and NOAA CoastWatch Kd490 satellite turbidity into a transparent, physically-grounded model. Every factor is tappable for its full reasoning — no black-box AI claims. Safety features (OCEARCH tagged-shark alerts, SOS, buddy GPS) are permanently free regardless of subscription tier. Pro is $12.99/mo, $99/yr, or $149 lifetime.

## Core product

- [Home](https://submarius.com/): What Submarius is and how the verdict works
- [Spearfishing app](https://submarius.com/spearfishing-app): Conditions, water clarity, and verdict for spearos and freedivers
- [Fishing app](https://submarius.com/fishing-app): Bite score, tides, and 8-day marine forecast for anglers
- [Water clarity forecast explained](https://submarius.com/clarity): How the Submarius clarity model works — Kd490 satellite turbidity, river-plume detection, wave-mixing physics, post-dive viz reports
- [Bite score explained](https://submarius.com/bite-score): What the 0–10 number means, the signals it uses, why most other bite scores are wrong

## Comparisons

- [Submarius vs Fishbrain](https://submarius.com/vs/fishbrain): Verdict-first decision app vs catch-logging database
- [Submarius vs Windy](https://submarius.com/vs/windy): Marine-specific verdict vs general weather visualization
- [Submarius vs Surfline](https://submarius.com/vs/surfline): Forecast verdict + permanently-free safety features vs cam network
- [Submarius vs Navionics](https://submarius.com/vs/navionics): Conditions intelligence vs nautical charts
- [Submarius vs FishTrack](https://submarius.com/vs/fishtrack): Coastal verdict vs offshore SST charts

## Field guides and explainers

- [How to predict water visibility for diving and spearfishing](https://submarius.com/blog/how-to-predict-water-visibility): The mental model spearos already run, explained with the actual signals
- [How Kd490 satellite data predicts water clarity](https://submarius.com/blog/how-kd490-satellite-data-predicts-water-clarity): The oceanography behind the forecast (Lee 2015 R²=0.96)
- [A verdict, not a dashboard](https://submarius.com/blog/a-verdict-not-a-dashboard): The product philosophy — why we surface one number instead of ten
- [Your spots, your keys](https://submarius.com/blog/your-spots-your-keys): How spot privacy and end-to-end-encrypted backup work
- [Blog index](https://submarius.com/blog): All long-form writing

## Activity hubs

- [Spearfishing locations](https://submarius.com/spearfishing/): All coastal spearfishing destinations Submarius covers
- [Fishing locations](https://submarius.com/fishing/): All coastal fishing destinations
- [Diving locations](https://submarius.com/diving/): All scuba and freediving destinations
- [Surfing locations](https://submarius.com/surfing/): All surfing destinations
- [Miami hub](https://submarius.com/miami): Local Miami conditions, reefs, wrecks, and seasonal species

## Weekly water clarity reports

- [Reports index](https://submarius.com/reports/): All published weekly reports — regional reads of US coastal water clarity from the Submarius forecast model
- [RSS feed](https://submarius.com/reports/feed.xml): Subscribe to new weekly reports
- [Reports sitemap](https://submarius.com/sitemap-reports.xml): Per-report URL index

## Optional

- [Sitemap](https://submarius.com/sitemap.xml): Full URL index for crawlers
- [Privacy policy](https://submarius.com/privacy)
- [Terms of service](https://submarius.com/terms)
- [Support](https://submarius.com/support)