Submarius
Field guides, model explainers, and product thinking.
Long form writing from the Submarius team, for spearos, divers, anglers, and boaters who want to understand the ocean better, and for technically curious readers who want to see how we build honest forecasts.
Your spots, your keys: how we encrypt spots and trips
We can't read the saved spots or GPS tracks you back up. Here's exactly how the encryption works, what the server sees, and what happens if you lose your phone.
A verdict, not a dashboard: one answer you can trust
Most marine apps throw numbers at you and leave the decision to you. The case for an app that answers the real question: is today worth it?
How Kd490 satellite data predicts water clarity
The oceanography behind the Submarius visibility estimate: what Kd490 is, how a satellite measures it from orbit, and what it can and can't tell a diver.
How to predict underwater visibility before a dive
The six signals divers and spearos read before a trip: wind, swell, rain, tide, chlorophyll and coastline shape, and what each one does to visibility.