Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Official tide tables
- Current atlas or predictions
- Local chart
Step-by-step instructions
Find the correct station
Choose a relevant prediction site and identify differences between the reference port and the actual passage location.
Identify what is predicted
Tidal height predicts water level; tidal current predicts flow direction and speed. They are different products.
Convert time zones carefully
Check whether values use local standard time, daylight time or UTC, particularly when crossing borders.
Apply to critical areas
Review shallow entrances, bridge clearance and channels where wind against tidal flow may produce steeper waves.
Update with observed conditions
Weather pressure, runoff and local geography can produce water levels or currents that differ from predictions.
Safety note
Never pass a shallow entrance on a predicted depth with no safety margin; charts and predictions have uncertainties.
Key takeaway
Time zone errors and confusing tide with current are avoidable passage-planning mistakes.
Keep this job on your maintenance schedule
Save the topic as a maintenance task, choose a due date or engine-hour target, and record future service. Free and stored on your device.
Add to my maintenance plannerThis guide is for general education. Follow your equipment manufacturer’s instructions, current navigation guidance and applicable marine safety standards. When uncertain, use a qualified marine professional.