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 Submarius encrypts your dive log
We can't read your saved spots, GPS tracks, or dive log. Here's exactly how the encryption works, what the server sees, and what happens if you lose your phone.
A verdict, not a dashboard: why your ocean app should just tell you to go
Every marine app throws numbers at you and leaves the decision. That's a design failure dressed up as transparency. The case for apps that just answer: is today worth it?
How Kd490 satellite data predicts water clarity
The oceanography behind Submarius's visibility forecast — what Kd490 is, how a satellite measures it from orbit, and how Lee et al. 2015 turns it into a Secchi-depth estimate divers can use.
How to predict water visibility for diving and spearfishing
The six signals serious divers and spearos read before a trip — wind, swell, rainfall, tide, chlorophyll, coastline geometry. What each does to viz, and what satellite data adds today.