Ōsaki
Kotsubo · Zushi, Kanagawa, Japan · Reef break
Local time — · Sunrise 06:11 · Sunset 16:42
Reading the ocean.
SWELLRADAR is requesting a verified marine run for Ōsaki.
Spot intelligence.
Ōsaki is the offshore reef beyond the eastern side of Zushi Marina, distinct from Kabune. The original local guides restrict it to advanced surfers. Advanced is the minimum recommendation gate, not clearance in typhoon surf; the generic model band does not establish that the reef is breaking or that a paddle-out is possible.
Profile source · Surfers' Ocean · original Ōsaki section with own field photographsProfile sources & limits
Reviewed 23 Oct 2026 · not observation-validated
Published sources reviewed by SWELLRADAR, not validation against measured breaking waves. Directional references are qualitative ranking inputs, not surveyed optima or full acceptance windows. The inherited generic 0.6–3.0 m offshore-model band remains unchanged and unvalidated: not a local working range, safe learner range or wave-face conversion. Original approximate map pins and location sources remain. Explicit sea requests do not survey takeoffs, reefs, sandbanks, currents, access or provider-snapped cells. Surfers' Ocean's separately photographed Ōsaki section reports an SSW preference within a broader WSW–SSE sector, rock bottom, a long paddle and hollow middle sections, explicitly excluding learners and intermediates. ONEFAT's own 2024 account corroborates those mechanics and reports NNE wind. Surfaround instead gives N–NW wind, so no universal clean-wind axis or opposite-swell fallback is scored. Tide response and handedness are not established sufficiently and are not invented. Historical typhoon/low-pressure descriptions are not storm-refuge advice, a safe activation threshold or real-time access clearance. Nothing from this reef is used to lift Kabune's research hold.
- Surfers' Ocean · original Ōsaki section with own field photographs
Distinct Ōsaki section: advanced rock reef, SSW reference within WSW–SSE, distant paddle and powerful/hollow middle section; Kabune is separately described.
- ONEFAT · own Ōsaki surfing account, March 2024
Identifies offshore reef beyond Zushi Marina's eastern side, advanced-only context, long paddle/strong currents, hollow middle section and independent NNE wind.
- Surfaround · original Ōsaki point entry
Reports reef and broader W–SE exposure, but N–NW offshore wind differs from ONEFAT's NNE; this uncertainty disables directional wind scoring.
Source-informed axes
Swell axis SSW · 203°
Wind axis pending · Advanced profile
Wave
Powerful reef walls · hollow middle section
Rock reef · offshore peak
Swell window
SSW · qualitative reef reference
0.6–3.0 m offshore ranking band
Clean wind
Northerly sector unresolved · check locally
No wind-direction bonus
Tide window
Reef-depth dependent · check locally
No tide phase affects scoring
Field guide
Read the break.
Character · setup · local read
Field guide
Read the break.
Character
01Ōsaki is defined by powerful reef walls · hollow middle section over rock reef · offshore peak. The shape can change with swell angle, period and the active section, so the live score should always be paired with a visual check from shore.
Best setup
02SSW · qualitative reef reference swell, northerly sector unresolved · check locally and reef-depth dependent · check locally form the profile baseline. SWELLRADAR retains 0.6–3.0 m as an offshore-model ranking band, not a measured local surf limit or a breaking-wave prediction.
Lineup read
03This is an advanced profile: positioning, entry and exit should be assessed before committing. Pay particular attention to strong currents in larger swell, long paddle to the reef, powerful hollow sections and rock contact. Local signs and advice always take priority.
Know before you paddle
Live conditions and local advice always override this profile.
Optional community layerRecent surfer reportsVoluntary and potentially incomplete. Not used for the forecast or Surf Score.
The break
Reef break
Advanced. Works best with SSW · qualitative reef reference swell.
Timing
Northerly sector unresolved · check locally
Reef-depth dependent · check locally. Re-check local observations and the lineup before you paddle out.
Data note
Model data unavailable
SWELLRADAR withholds numerical conditions, scores and surf windows until a quality-checked marine forecast is available.