A current prediction is useful only when it describes the right place, date and time convention. Before using it to assess an Inside Passage rapid or constriction, identify the official product and exact current station for that waterway.
Keep the prediction in a larger departure picture. Weather, traffic, notices, daylight, observed conditions and the readiness of the boat and crew require separate attention. The table provides information; the responsible operator decides whether the actual situation supports a transit.
Tide Height and Current Timing Answer Different Questions
A tide prediction describes vertical water level. A current prediction describes horizontal water movement. Canadian Tide and Current Tables distinguish predicted high- and low-water times and heights from predicted slack-water and maximum-current times and velocities.
| Product | Question it helps answer | Details to preserve |
|---|---|---|
| Tide prediction | What water level is predicted at the stated station? | Station, date, height units, datum and time convention |
| Current prediction | What horizontal flow events and velocities are predicted at the stated station? | Station, reference relationship, date, velocity units, direction and time convention |
Do not derive slack-current timing from a nearby tide-height table. Use the current product and the relationship explicitly supplied for the actual location. A predicted slack event does not guarantee a particular observed flow, duration or vessel response.
Choose the Official Product for the Waterway
For Canadian waters, start with the current Canadian Hydrographic Service publications. The 2026 Pacific tables cover Juan de Fuca Strait and Strait of Georgia in Volume 5, Discovery Passage and the west coast of Vancouver Island in Volume 6, and Queen Charlotte Sound to Dixon Entrance in Volume 7.
For U.S. waters, use the matching NOAA current prediction product. Confirm that the page concerns a current station, rather than a tide station or a nearby map result. Follow the product’s own station and reference instructions.
Check charts, publications and applicable notices alongside the prediction. A named channel on a chart and a station with a similar name are not automatically equivalent. Geographic closeness does not establish a valid substitute.
Read the Station’s Reference and Time Notes
NOAA current prediction guidance explains that subordinate stations use time offsets and velocity ratios associated with a reference station. Their displayed curves can interpolate between known predicted events. Those values are predictions, rather than direct observations of the water now.
NOAA also explains that some stations have predictions for particular depths, while older station data may represent a mean current without a specified depth. Preserve the depth convention when one is supplied.
Read the product’s time notes before copying a value. Record the displayed zone and whether daylight-saving time is already applied or requires a conversion. Different printed and digital products may handle the clock differently, so a remembered conversion rule is insufficient. Check the travel date after setting the time controls.
Keep One Verified Current Record
A short record can prevent a station, screenshot and remembered time from blending together. Keep these fields visible:
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Exact waterway and jurisdiction.
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Product name, edition or update state, and the date accessed.
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Current station name and identifier, with any stated reference relationship.
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Travel date, displayed time convention and applicable daylight-saving instruction.
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Predicted event, direction and velocity units, with depth information where supplied.
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Current chart, publication and notice checks.
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The next recheck and any unresolved question.
Copy only what the product actually provides. Leave an unresolved field marked as such rather than filling it from a nearby station. A saved screenshot is a useful reference only when its station, year, units, clock and relevant notes remain visible; reopen the official source before relying on it.
Put the Prediction Beside Live Conditions
Compare the verified prediction with the conditions relevant to the actual trip. Review forecasts and available observations, traffic, visibility, daylight and current restrictions. A favorable table entry cannot resolve an unfavorable condition elsewhere in the plan.
The guide to weather-window planning for Pacific Northwest coastal hops develops the wind, wave and arrival assessment. Keep that work separate from the current-station lookup, then consider the results together.
Review the boat’s condition, equipment instructions and handling limits with the crew’s experience and readiness. If observations conflict with the planning picture, recheck the station, date, clock and notices. Obtain current local or professional guidance when the relationship or operating decision remains unclear. There is no universal current speed or fixed advance-arrival interval that settles every rapid.
Resolve Uncertainty Before Committing
For an unresolved question, provide the authority or qualified local professional with the exact waterway, travel date, boat and sources already checked. Ask about the particular gap rather than seeking a reusable number for other locations.
Our discussion of navigation and communications redundancy for remote cruising helps you plan access to information and backups. Electronics and connectivity still do not replace the station check or determine whether a transit is suitable.
Before departure, verify the official current product, station, date, time convention and current notices. Reassess when conditions or the plan change, and keep the operational decision tied to the complete live picture.