Submarius: Dive and Fish

Submarius reads the ocean and tells you one thing: GO or DON'T. Dive weather, bite forecast, and water-clarity forecast for spearfishing, diving, fishing, and boating — built for people who are tired of stitching together four apps to decide if today is worth the drive.

A VERDICT, NOT A DASHBOARD
Every factor — wind, swell, tide, moon, pressure, water temperature, water clarity — goes into a single 0–10 verdict you can read in two seconds. Tap any factor to see the numbers and the reasoning. No black-box "AI" — every input is transparent.

THE HONEST WATER-CLARITY FORECAST
No other major app has this. Submarius fuses multi-sensor satellite ocean color (NASA PACE, ESA Sentinel-3 via Copernicus Marine, NOAA CoastWatch VIIRS) with USGS river-discharge data, wave-driven sediment resuspension physics, and community post-dive reports — producing horizontal-visibility estimates with explicit p10 / p50 / p90 uncertainty bands. Grounded in Lee et al. 2015 (R²=0.96 against in-situ Secchi). When we don't know, we say so.

EIGHT ACTIVITY MODES
Spearfishing, freediving, scuba, fishing, boating, sailing, surfing, kayak/SUP. Each mode reweights the verdict around what actually matters for that activity — clarity and tide for spearos, swell period and wind for surfers, solunar windows for anglers, small-craft conditions for boaters.

BITE SCORE WITH TRANSPARENT FACTORS
Tide stage, moon phase, solunar windows, barometric trend, wind, and water temperature combined into a 0–10 score, factor by factor. No secret formula. If we score a day a 3, you'll know exactly why.

MAP THAT'S ACTUALLY USEFUL
Bathymetry, sea-surface temperature, animated weather radar, wind direction and speed, reef habitat, wreck and structure overlays, NOAA nautical charts, water-clarity heatmap. Finds drop-offs, temperature breaks, and shelter without dragging you to another app.

LIVE GPS TRACKS
Record your dive or fishing trip as a live blue track on the map. Useful for retracing drift, marking productive zones, or just remembering the line you swam. Optional end-to-end encrypted cross-device backup — we never see the points.

SPOT PRIVACY, BY DEFAULT
Your spots stay your spots. Post-dive clarity reports ship with H3-cell-fuzzed coordinates (~5 km hexagon) so the community map doesn't expose your honey hole. Precise location never leaves your device unless you explicitly share it.

ANONYMOUS-FIRST
Current conditions, today's verdict, and basic bite score work without an account. Sign up when you want to save spots, post catches, or sync across devices.

SUBMARIUS PRO
Pro unlocks the 8-day forecast, premium map overlays (bathymetry, SST, radar, wind, NOAA charts, reef and wreck overlays), offline maps, unlimited saved spots, advanced bite-score layers, full water-clarity forecast horizon, and catch/trip GPX export. $12/month or $99/year with a 7-day free trial. Limited $149 lifetime tier for the first 1,000 founders.

Subscriptions are billed through Google Play and renew automatically unless cancelled at least 24 hours before the end of the current period. Manage your subscription in the Google Play app → Profile → Payments and subscriptions → Subscriptions.

Privacy: https://submarius.com/privacy
Terms: https://submarius.com/terms