A Tokyo Bay departure desk tied to a real visitor marina, local marine products and bay traffic information.
Confirm the actual visitor berth
This desk is for Yokohama Bayside Marina, not every facility carrying the Yokohama name. The operator publishes visitor-berth information and recommends advance reservation. Confirm the current berth and access details directly; a published generic water-depth figure is not the available depth for your vessel at arrival.
Bay departure and offshore continuation need separate evidence
For a Tokyo Bay outing, match the local marine product and observations to the bay leg. For an onward passage beyond the bay, add the appropriate JMA marine area and wave product for the exposed coast rather than extending the marina reading. Record both the exit ETA and arrival ETA, especially if the route lasts longer than the initial issue.
Use local observations with a timestamp and role
The Coast Guard Tokyo Bay condition page links to local observation and water information. Follow the underlying product and verify whether it is a measurement or prediction, its time and its relevance to the exposed leg. A missing or old observation remains missing information; a sheltered station cannot be used to cancel an exposed-area warning.
Tide height is not the timing of every current
Obtain the relevant tide and current product where approach or progress makes it important. Check location, date, time basis and datum; do not substitute a tide-height curve for a tidal-stream prediction. Evaluate draft and access with the operator and current navigation publications, not an offshore model grid or the approximate map on this page.
Traffic-centre information and port manuals have different scope
Consult the Tokyo Bay Vessel Traffic Service for relevant current traffic/navigation information and the City of Yokohama entry page for publications and amendments. Check which provisions apply to your actual route and vessel; do not copy requirements for commercial port movements into a yacht plan without confirming applicability. An edition date is not proof that no later instruction exists.
Test the return before committing to the outing
Compare the planned return with a slower passage: update arrival wind/waves, visibility, light and marina access. Keep the berth confirmation, source issues, unresolved gaps and next check in the brief. If conditions or local instructions change, reassess the whole outing rather than looking only at the start wind. The skipper retains the final decision and responsibility.
Official products by task
- Yokohama Bayside Marina visitor berths — The marina operator's own reservation, access and harbour information. Confirm a berth and current approach details directly; published depth is not a clearance for your draft.
- JMA marine warnings and forecasts — Named Japanese marine areas; select the applicable area, current issue and valid period. This JavaScript product is not an automatic route-coverage match.
- JMA wave analysis chart — seas around Japan — An analysis chart for its stated time, not a forecast of the next passage. It shows significant wave height, not the maximum individual wave, and does not resolve a marina entrance or local tidal stream.
- JMA wave forecast chart — seas around Japan — A distinct forecast chart; preserve its issue and selected valid time for the exposed-leg ETA. Significant wave height is not an individual maximum, and a regional wave chart is not an entrance-current or breaking-wave assessment.
- Japan Coast Guard Tokyo Bay weather and ocean information — Local official links to observations, water levels, tides and current information; follow the underlying station or product and check its timestamp and exposure.
- Japan Coast Guard tide and tidal-current predictions — Separate tide heights from tidal streams; select the specific location or strait, date, time basis and datum. An index is not a prediction for every Japanese passage.
- Japan Coast Guard Tokyo Bay Vessel Traffic Service — Traffic and navigation information for Tokyo Bay; follow current notices and official instructions. This is not a weather forecast or a berth booking.
- City of Yokohama port-entry information — Port-entry publications and amendment links. The linked English manual has a stated edition; confirm later amendments and applicability to your vessel with the authority.
Countries and local sources
- Japan
Choose the Japanese coast and passage type first: island weather, bay traffic and tidal straits need different evidence.
Map orientation
The approximate area centre is not an approach waypoint, a track, a depth survey or a forecast-zone boundary. The third-party map loads only after your click.
Prepare a passage brief
Bring route timings, vessel and crew profile together with checked sources and reassessment triggers. Personal AI analysis and expert review are in invitation-only closed testing. An editorial geographic page does not extend the calculation service’s actual coverage.