All tools
Tide, current and passage tools for kayak, dinghy and small-sailboat skippers: slack-window finders, drift correction, unit conversions and printable reference cards.
Stages
Jump to directory| No | Stage | What it covers |
|---|---|---|
| 01 | Read | Establish the tide, current and weather facts for the day. |
| 02 | Plan | Fix departure, track and finish on one timeline. |
| 03 | Run | Execute on the water and keep the abort window open. |
Directory
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Calculators
Back to topCalculatorSecondary Port Tide OffsetMove a standard-port high water time and height to a secondary port.Calculate CalculatorDrift TriangleSolve the heading that holds a chosen track through a cross current.Calculate CalculatorTrim BalanceScore a loaded kayak for fore-and-aft balance before launch.Calculate
Categories
Back to topTide & CurrentRead the water before you commit to a departure.Passage PlanningTurn a departure time into a leg with a known finish.ConversionsMove between knots, paces, units and bearings without a mistake.AboardLoad, trim and ground tackle decisions made on deck.ReferencePrintable tables and index cards for the cockpit.
Quick reference
Back to top| Item | Value | Note |
|---|---|---|
| One nautical mile | 1,852 m | 1852 metres exactly; do not round to 1,850 for a measured leg |
| One knot | 1.852 km/h | A pace of 32 min per mile is about 1.9 knots |
| One fathom | 1.83 m | Six feet; convert in one step, not two |
| Spring range | 2.0 to 5.5 m | Window length scales with range, not with printed time |
| Neap range | 0.8 to 2.4 m | Slack periods shorten; margins must grow |
| Current turn | site specific | Offset is published against a named reference port |
| Drift angle | tan(set, rate) | Above 20 degrees, re-time the leg |
| Chart datum | below MSL | Roughly half the local spring range below mean sea level |