How to Plan a Coastal Sailing Passage

A practical step‑by‑step guide to planning a safe, realistic coastal sailing passage in Australian waters: choosing a route, estimating distance and time, checking weather and tides, fuel and daylight planning, identifying safe harbours and anchorages, and preparing backup plans.

Direct answer: Plan your coastal passage by selecting a realistic route that matches your boat and crew, calculating distance and time with conservative speed estimates, choosing a suitable weather window and tide times, confirming fuel and provisioning needs, identifying safe harbours and reliable anchorages along the way, and creating clear backup plans and turning‑points before departure.

Overview: what good passage planning achieves

Good planning reduces risk, keeps you flexible, and makes the trip enjoyable. In Australia that means accounting for variable weather patterns, tidal streams around headlands and estuaries, remoteness on some stretches, and daylight limits during the season.

Step 1 — Choose a route that fits your boat and crew

Pick a route that matches your vessel's seakeeping, fuel and water capacity, and the experience and fitness of your crew.

Coastal day hops: shorter distances between ports, easier to shelter, suitable for less experienced crews.
Open coastal legs: longer exposure to swell and wind; need better seaworthiness and reserve fuel.
Use well‑charted channels and keep clear of known hazards such as reefs and mining exclusion zones shown on official charts.

Step 2 — Estimate distance and time

Measure the rhumbline and practical track distance using charts or electronic chartplotters. Add allowances for inshore deviations, detours and tidal offsets.

Calculate time using a conservative cruising speed (not maximum): choose a speed you can comfortably maintain in typical conditions.
Account for tidal streams: plan extra time for adverse streams and favourable surfing where appropriate.
Build in contingency time (for example 20–30%) rather than leaving zero margin.

Example timing approach

Planned distance: 60 nautical miles.
Conservative cruise speed: 6 kn. Estimated run time = 60 / 6 = 10 hours.
Add contingency 25% = 2.5 hours. Total planning time = 12.5 hours.

Step 3 — Choose suitable weather windows

Look for a sustained period of favourable wind direction and strength and manageable sea state for your boat. Avoid planning long exposed legs when strong winds or swell are forecast.

Check multiple sources: synoptic charts, local forecasts, high‑resolution model guidance and marine observations.
Understand typical seasonal patterns in your region (e.g. sea breezes, frontal passages, monsoon influences) and when they occur during the day.
Prefer departures that allow you to reach shelter before forecast deterioration or darkness if you are not prepared for night passages.

Step 4 — Tides and tidal streams

Tides can speed you up or slow you down and create strong currents around headlands, inlets and narrow channels.

Use local tide tables and tidal stream atlases to identify favourable or adverse stream windows for each leg.
Plan critical passages (headlands, entrances, bars) to occur at times when tidal streams are weaker or in your favour.
Allow extra time for navigating in changing tidal conditions and for reduced speed through strong streams.

Step 5 — Fuel, water and provisioning

Confirm onboard fuel and water reserves, and where you can top up en route.

Calculate fuel consumption for the planned engine hours plus contingency. Remember fuel use rises if motoring into wind and waves.
Plan refuelling stops at reliable marinas or fuel pontoons and identify alternates in case facilities are closed.
Stock food, water and basic spares to cover delays and an overnight stop if needed.

Step 6 — Daylight and night considerations

Decide whether you will do the leg in daylight only or include night passages. In Australia, daylight hours vary widely by season and latitude.

For daytime passages, ensure estimated arrival is well before dusk; allow margin for unexpected delays.
If planning to go at night, ensure adequate crew rest, watch systems, navigation lights, and familiarity with required navigation in darkness.

Step 7 — Identify safe harbours and anchorages

List reliable safe havens along the route where you can shelter from weather or stop overnight.

Include main harbours and a few sheltered anchorages that are achievable in different wind directions.
For each shelter note approach considerations, depth, holding type, swinging room, and likely shelter from prevailing winds.
Prefer anchorages with multiple options for swing, and identify nearby alternatives in case of crowding or poor holding.

Step 8 — Backup plans and decision points

Set clear go/no‑go criteria and specific decision points where you will alter plans.

Define weather limits and fuel margins that will trigger diversion or turning back.
Choose turning points en route where you will reassess the plan and have a clear alternative destination.
Share your plan and likely alternates with someone ashore and confirm check‑in times.

Step 9 — Safety briefings and equipment checks

Before leaving, brief the crew and complete essential checks.

Safety briefing: roles, sail handling, man‑overboard procedure, communication plan and muster stations.
Equipment: engine, fuel and bilge checks; navigation lights; lifejackets and harnesses; working chartplotter and paper chart backups; VHF and handheld radio with charged batteries.
Emergency items: EPIRB, flares, water, first aid and tools for common repairs.

Quick planning checklist

Route chosen and distance measured
Estimated time with conservative speed and contingency
Weather window identified
Tidal stream planning for critical points
Fuel, water and provisioning confirmed
Daylight/night plan set
Safe harbours and anchorages listed
Backup plans, turning points and go/no‑go criteria
Crew safety briefing and equipment checks complete

Practical examples of conservative decisions

If forecast swell is larger than your comfort level, split the leg into shorter hops with more sheltered stopping points.
If a tidal stream will create more than a modest speed penalty, delay departure to catch slack or favourable flow through the narrow passage.
If fuel margin looks tight, plan an intermediate refuel stop rather than risking reduced options later.

Useful tools and sources

Use official charts, tide tables, reputable marine weather services and local knowledge from marinas and clubs. Electronic chartplotters, tidal stream atlases and up‑to‑date pilot guides are helpful when combined with common sense and local advice.

Actionable next steps

Draft your intended route on a chart and calculate distance.
Estimate run time with a conservative speed and add contingency.
Check weather and tides for the proposed window and revise departure time accordingly.
Identify at least two safe harbours and two anchorages along the way and confirm fuel availability.
Complete crew briefing and equipment checks, then file your float plan with a responsible person ashore.

Good planning makes coastal passages safer and more enjoyable. Start early, be conservative in your assumptions, and keep alternatives ready so you can adapt to conditions on the day.