Insights from 46,000+ observations and AI models, presented with interactive charts.
🌊 Visibility Forecast App
Check AI-powered visibility forecasts for 30+ sites across Japan →
192 articles
Osezaki Complete Visibility Guide — Bay, Open Sea, Point & Futone (4,300 Obs)
4 zones compared from 4,300+ observations. Bay 7.6m vs Open Sea 10.6m vs Futone 12.3m.
2026-03-16
Koganezaki Visibility Analysis — 1,100 Days of West Izu Macro Diving Data
13.5m avg, March 15.8m tops Izu Peninsula. Unique zigzag seasonal pattern explained.
2026-03-16
Onagawa Diving Visibility & Water Temperature — Tohoku's Only Data
52 observations from Onagawa. Winter avg 5.9m, 7–15°C. Tohoku's only diving visibility record.
2026-03-16
Muroto & Kannoura Diving Visibility — Eastern Kochi's True Potential
Muroto (8.8m) vs Kannoura (9.1m). Why they trail Kashiwajima by 5m in the same prefecture.
2026-03-16
Tago, Futone & Shirasaki — Hidden Gems of West Izu & Wakayama
Futone 12.3m, Tagojima 10.9m, Shirasaki 10.3m. Underrated sites compared with data.
2026-03-16
Ito (Tateyama) Seasonal Deep Dive — Why Winter Peaks at 18.8m
Winter Dec 18.7m / Jan 18.8m tops Honshu. 1,985 observations reveal the shark town's clarity.
2026-03-16
Kashiwajima: May Has the Most Data — 249 Obs Reveal Early Summer
May leads with 249 obs but only 11.0m visibility. Winter Jan 16.8m is the real peak.
2026-03-16
Wind Direction Visibility Guide: Which Wind Clears Your Dive Site?
Ito gains +2.7m with north wind, Kerama +2.3m with south. 10-site wind analysis.
2026-03-16
IOP + West Wind = 16.4m Visibility! Wind Direction Analysis (3,200 Obs)
West wind 16.4m vs south wind 12.1m. 4.3m gap depending on wind at IOP.
2026-03-16
Okinawa Gets Clearer with South Wind: Kerama, Ishigaki & Yonaguni Patterns
Kerama SE wind 20.6m vs NW 17.5m (3.1m gap). Wind effects at 4 Okinawa-area sites.
2026-03-16
Hot Water = Clear or Murky? The Temperature-Visibility Link Reverses by Region
Yakushima 29.3m at 25°C+ vs Ito 22.1m under 15°C. Opposite temperature-visibility patterns.
2026-03-16
Which Sites Get Clearer (or Murkier) When Water Hits 25°C+?
Yakushima 29.3m vs Hirasawa 7.0m. Same hot water, 4x visibility difference.
2026-03-16