The passage that goes badly usually fails at the planning stage, not on the water. A crew that arrives at a headland at max spring ebb because nobody checked the current tables, or that presses on toward an unfamiliar harbor entrance at night in deteriorating weather because there was no contingency harbor identified, or that can't be located by the Coast Guard because no float plan existed — these outcomes were available for prevention at the chart table 24 hours before departure. Passage planning is not paperwork. It is the systematic application of experience to the specific geometry of the passage ahead.
The Planning Hierarchy: Strategic, Tactical, Execution
Good passage planning works top-down through three levels, each constraining the next.
Strategic planning happens weeks or months out: where are you going, what season, what are the dominant wind patterns and typical weather hazards for that season and region? A passage from the Pacific Northwest to Alaska happens in June or July — not September, when fall gales begin. A Gulf Stream crossing to the Bahamas happens in a settled weather window after a departing cold front — not in front of one. Strategic planning is about fitting the passage to the season and avoiding the windows that experience has shown to be consistently dangerous.
Tactical planning happens days to weeks before departure: which specific route, which weather forecast window, what are the critical waypoints and tidal gates, what do the cruising guides say about the specific anchorages planned? This is when you pull the charts, mark the hazards, identify the tidal gates and their timing requirements, and make the route decisions that will constrain everything downstream.
Execution planning happens 48–72 hours before departure and up to the moment of casting off: final weather assessment, waypoint entry and verification in the chartplotter, float plan filed, boat systems checked, watches assigned. This level is about turning the tactical plan into actions and confirming that conditions match the plan.
Most amateur passage planning skips the first two levels and starts at execution — someone decides to go, checks a weather app, and enters a rough route in the chartplotter. This works on familiar passages in familiar conditions. It fails when the strategic reality (wrong season, wrong weather pattern) or the tactical reality (unmarked shoal in the approach, tidal gate on a spring ebb) surfaces after departure and there's no framework for responding.
Charts and Publications: What to Pull Before You Go
The chart folio for the passage: pull every chart that covers the route plus adjacent areas representing your contingency options. Overlap matters — know where each chart's coverage ends and where the next begins. For a coastal passage, this typically means small-scale overview charts plus large-scale harbor approach charts for every planned stop and every possible contingency stop.
The Coast Pilot (NOAA Publication, free as PDF from nauticalcharts.noaa.gov, 9 volumes covering US waters) is the document that most sailors don't read and all sailors should. It contains what no chart can convey: narrative descriptions of harbor approaches, local current patterns, seasonal hazards, lights and their arc sectors, bridge clearances, anchorage notes, local knowledge that accumulated over 150 years of US coastal surveying. Before a passage through unfamiliar waters, reading the relevant Coast Pilot section — even a quick skim — is worth the 20 minutes. The Pilot will tell you things about an approach that the chart omits because charts show what's there, not how to interpret it.
The Light List (also free from USCG) describes every aid to navigation with more detail than charts can show: exact light characteristic, arc, range, structure description, fog signal. When you're night-entering a harbor and need to confirm which flashing light you're looking at, the Light List is the reference. Charts abbreviate; the Light List is complete.
The Local Notice to Mariners (published weekly by each USCG District, free online) reports changes to aids to navigation, temporary hazards, and survey notes. A light that went missing in a storm last week, a temporary wreck buoy placed in a channel, an area of blasting activity — these are in the LNM, not on any chart. For any passage through heavily trafficked waters, check the LNM for the relevant district before departing.
Building the Route: Waypoints and the Never-Put-It-On-the-Hazard Rule
Route building in a chartplotter is deceptively easy, which is how sailors create routes that lead directly into hazards. The discipline: every waypoint is a point you intend to pass through — not a hazard you intend to avoid. The chartplotter draws a straight line between consecutive waypoints; that line must be clear of hazards along its entire length, not just at the waypoints themselves.
The never put a waypoint on a hazard rule is literal. If you're rounding a headland with outlying rocks, your waypoint is not on the headland — it's at a safe distance beyond the outermost hazard. If you're entering a harbor past a shoal on the port side, your waypoint is not at the mouth of the entrance — it's positioned so the rhumb line from the previous waypoint keeps you clear of the shoal. The chartplotter assumes you can navigate a straight line; your job is to ensure that straight line doesn't cross anything dangerous.
Offset waypoints at headlands: when a passage requires rounding a prominent headland or cape, build in a waypoint at appropriate sea room from the tip. The typical offshore practice is to stand off headlands by 3–5 miles in moderate conditions to avoid overfalls, tide races, and the shipping traffic that cuts close to prominent marks. In fog or restricted visibility, increase the offset. The route looks longer on the chart; the passage is safer and often not much longer in time because you're in better sea conditions.
Name your waypoints meaningfully. "WP003" tells you nothing when you're trying to quickly assess the route at 0300 in the dark. "NE Pt Rock Clear" or "Race Island Offset" or "Harbor Entrance -0.3nm" is immediately readable and reduces errors during the passage.
Contingency Harbors: The Question Nobody Asks Until They Need To
For every leg of a passage, the planning question is: where do we go if conditions deteriorate, the engine fails, or someone gets hurt? The contingency harbor must be identifiable before departure, not discovered on the fly when someone is seasick and the barometer is falling. The requirement: it must be accessible at night, in the expected wind and sea conditions, with the boat's current engine and sail capability.
A harbor that you can reach in daylight in calm conditions is not a contingency if the failure scenario is an engine breakdown 20 miles offshore at midnight in 25 knots. Work through the scenario: can you sail to it? What does the entrance look like in the dark? Is there an accessible anchorage outside the main channel if the marina is full or the approach too complex for night entry? Can you anchor outside and wait for daylight?
Write the contingency harbors into the passage plan explicitly, not just in your head. When a crew member is asking what the plan is at 0200 in deteriorating conditions, the right answer is "the contingency is Mattapoisett, bearing 285, 14 miles" — not "let me think about it." The contingency plan established at the chart table is always better than the one improvised at sea.
Weather Windows: The 72-Hour Rule
The working rule for passage weather: trust the 72-hour forecast for detailed planning, use the 7-day only for strategic go/no-go. The 7-day NOAA forecast tells you whether there's a plausible weather window; the 72-hour tells you whether conditions will actually support the passage on the specific departure date. For passages under 48 hours, the 72-hour forecast is usually reliable enough to plan on. For longer passages, the weather is part of the passage, not something you can predict precisely before departure.
The GRIB download process: GRIB files are the raw model output — grid points of wind speed, direction, and pressure at regular intervals through the forecast period. Downloading GRIBs from GFS (Global Forecast System), ECMWF, or the NAM (North American Mesoscale model) and viewing them in a program like Expedition, OpenCPN, or PredictWind allows direct four-model comparison. When models agree, confidence is higher. When they diverge significantly, the atmosphere is genuinely uncertain and conservative planning is warranted — delay if you have the flexibility, build in more contingency time if you don't.
For coastal passages along the East Coast: the NOAA offshore zone forecast texts remain the most carefully prepared source for the passage conditions. Read the zone forecast for every zone your passage transits, including adjacent zones — the boundary between two zones is where forecast language sometimes doesn't align. When the zone forecast says "gales likely" in the transition zone between your departure and arrival, that's not language to rationalize around.
The Float Plan: Who Has It and What It Contains
A float plan is a document left with a responsible shore contact describing your passage: who's aboard, the vessel description, departure point, intended route, planned stops, and expected arrival time — plus instructions for what to do if they don't hear from you by a specified time.
The minimum content: vessel name and documentation number, hull and rig description, number of people aboard with names, departure point and time, destination, planned route and any intermediate stops, satellite phone or SSB number if carried, VHF channel monitored, expected arrival time and arrival contact. Critically: instructions to contact the Coast Guard if no check-in is received by the specified time plus a reasonable buffer.
For coastwise passages, leaving the float plan with a marina or a shore contact is standard. For offshore passages — Gulf Stream crossings, offshore runs to Bermuda or the Bahamas — filing a voluntary float plan with the nearest USCG sector is an option that costs nothing and gives SAR coordinators a starting point if the search begins. The USCG has a standard float plan form available at uscgboating.org.
Update the float plan when plans change. A contact holding a float plan that says you'll arrive Tuesday when you've decided to stop in Beaufort until Wednesday is worse than no float plan — it directs a search to the wrong place. Check in when you arrive. Check in when you change the plan.
The Pre-Departure Check
A disciplined pre-departure check takes 20–30 minutes and prevents the majority of mechanical problems that end passages early or create emergencies. The check is not a substitute for proper maintenance, but it catches the acute failures — the seacock left open, the bilge pump not responding, the running light burned out — before they become problems at sea.
Work through in systems: hull and deck — all seacocks closed or correctly positioned, hatches dogged, jacklines rigged if offshore; rig — cotter pins intact, standing rigging hand-tensioned, halyards and sheets free to run; sails — reef points led, sheets led and cleated correctly, main slides on track; engine — oil level, coolant level, raw water strainer clear, alternator belt tension, fuel level and fuel system primed; electrical — battery voltage and charge state, all navigation lights functional, VHF on and squelched; navigation — chartplotter on and route loaded, paper charts aboard and accessible, handheld GPS charged; safety equipment — flares within date, EPIRB battery date current and registered, life raft inspection current, PFDs accessible and properly fitted.
Write the list down and work through it physically. Mental checklists become incomplete checklists when you're distracted by a crew question or a last-minute dock conversation. The list takes the same time whether you write it down or not; the written version catches what the mental version misses.
At Sea: Position Logs, Watch Handoffs, Course Changes
Keep a written position log even with GPS. The habit: enter position (lat/lon or a coastal fix by landmarks), course, speed, barometer reading, and any relevant notes at each watch change and at significant course alterations. A log entry takes two minutes. The reasons to do it: if the GPS fails, you have a dead reckoning starting point; if there's a collision or grounding, you have a contemporaneous record; if someone else joins the watch, they have immediate situational awareness.
The watch handoff is a formal transfer of situational awareness, not a social exchange. The off-going watch tells the incoming watch: current position, course and speed, what's on the radar and AIS (identify every target by position and relative motion), the barometer trend over the last three hours, what weather is expected in the next six hours, any unusual notes about the boat or the rig. The incoming watch confirms they understand. This takes four minutes and eliminates the scenario where the incoming watch doesn't know about the fishing fleet three miles to starboard that the off-going watch has been tracking for an hour.
Course change procedure: before altering course for a waypoint, scan the horizon and radar for traffic in the new course direction. Confirm the chartplotter waypoint is correctly set for the intended destination. Record the course change in the log with time and position. Brief the other watch member. These are small actions that take 60 seconds; omitting them is how a boat ends up on a course toward a hazard that nobody noticed because the watch change happened simultaneously with the course change and nobody was quite sure what was current.
Passage planning is the part of sailing that rewards attention before departure with comfort and safety at sea. The work done at the chart table does not guarantee a good passage — weather surprises, equipment fails, plans change — but it provides a framework for intelligent improvisation when the actual conditions diverge from the plan. The passage that is well planned can adapt. The passage that was never planned has nothing to adapt from.