Concise answer
Break the hop into realistic daylight legs based on effective cruising speed and fuel consumption in likely sea states; for every planned overnight stop record a primary and at least one alternate anchorage or marina, map fuel availability and alternative refuel options, and list emergency/diversion choices (VHF cover, VMRS, nearest major port and med facilities). Use conservative margins for fuel, time, weather and tidal gates.
- Leg definition and performance modelling: calculate each day’s distance and expected time using your boat’s real-world cruising speed under anticipated conditions (sailing VMG or motoring speed into head seas). Model fuel burn for calm and adverse conditions, and set a usable-fuel reserve (greater than manufacturers’ minimums) that triggers diversion.
- Anchorages and berths — confirm specifics: for each stop list holding type (sand/weed/rock), swing room at lowest expected water, charted depth range, shelter for the forecast wind directions, entrance constraints (bars, shallow thresholds) and whether the anchorage is workable at the tidal state you expect to arrive. Phone marinas to confirm berthing and fuel availability and note opening hours.
- Fuel planning and contingencies: create a fuel-leg table showing distance between refuel points, expected burn for worst-case conditions, and remaining range with your reserve. Identify portable fuel carriage options that comply with safe handling and legal limits, and list private refuel options (barges, fuel trucks) where known.
- Tides, bars and weather gates: identify tidal windows for entrances, bar crossings and shallow channels and match them to forecast weather windows that make the entry safe. Plan buffer time so you’re not forced into night entries or bar crossings in rising wind.
- Redundancy and navigation: carry updated electronic charts plus paper or raster backups, confirm at least two methods of position-fixing (GNSS and radar/visual bearings), and fit reliable AIS/plotter and independent power for critical nav electronics.
- Communications and emergency options: list VHF coverage and channel plans, VMRS and volunteer rescue capabilities in the areas en route, likely tow providers and major ports that can accept diversion. Add satellite communicator or HF if the route has mobile/VHF black spots.
Why this approach works (technical rationale)
- Modelling performance in both calm and adverse states recognises that fuel consumption and speed vary non-linearly with sea state and wind angle; planning to worst-case keeps reserve margins meaningful.
- Confirming holding, swing room and depth at low water prevents anchor dragging, fouling or being set ashore by tide changes—chart depth alone doesn’t tell you holding or wind exposure.
- Tidal and weather gates are critical because entrance safety (especially bars) is a function of both tide and sea/wind state; matching windows reduces the risk of forced diversions or risky crossings.
- Redundancy (charts, fixes, comms) mitigates single-point failures: electronics fail, mobiles drop out and local knowledge varies—having more than one reliable system means you can still navigate and call for help.
Likely mistakes advanced crews still make (expanded)
- Trusting ‘paper’ boat performance: using calm-water speeds to set legs without modelling head-seas or upwind VMG leads to underfuelled legs and late arrivals. Advanced crews often underestimate aggregated delays (calm to adverse, anchor checks, channel waiting).
- Assuming anchorages are good in all conditions: many anchorages offer protection only from a limited quadrant of wind; crews miss this when switching planned overnight spots after a weather change.
- One-source fuel confirmation: calling a marina once then assuming fuel is available on arrival—pumps can be offline, barges full or opening hours different; advanced planning includes alternates and contact protocols.
- Overlooking tow and med resources: assuming a commercial tow will arrive quickly or that a small harbour can accept an urgent diversion; check whether towing assets operate in your stretch and whether ports accept small craft at short notice.
- Overconfidence with night or marginal entries: advanced sailors sometimes accept marginal night entries because of schedule pressure—this materially increases risk; build conservative daylight buffers.
Practical next step (actionable worksheet you can use)
Create a spreadsheet with one row per planned day containing these columns: departure time and tide state, waypoints with coordinates, distance and estimated time under calm and adverse conditions, fuel burn calm/adverse and remaining fuel with reserve trigger, primary anchorage/marina (holding type, depth range at low water, swing radius, shelter quadrants), alternate anchorage, nearest VHF/VMRS unit and mobile coverage notes, diversion port and nearest hospital. Verify every cell against current charts, Notices to Mariners and the latest weather/tide forecasts before departure.
If you want, I can draft that worksheet for a specific NSW stretch—tell me your start and end ports, boat type (sail or power), LOA and usable fuel capacity and preferred daily distance. Note: I can’t supply live tide, weather or official notices — you’ll need to confirm those with official sources such as the Bureau of Meteorology, NSW maritime services and official charts.