Voyage Planning Quiz

Harbour approaches combine fatigue, dense navigation detail, thin depth margins, and often deteriorating visibility. A prepared pilotage plan allows the navigator to guide the boat through a pre-studied sequence rather than interpreting a complex chart under pressure.

The tidal gate's time window is fixed by physics. The passage time is estimated from distance and expected speed. Working backward from the gate gives the departure time — which may be earlier or later than you'd prefer, but it's the only time that works.

A bolt-hole must be usable when you need it — which means bad conditions. A harbour with a shallow bar, a complex approach, or limited access at certain tide states may not be reachable precisely when conditions force you to divert.

COLREGS Rule 10 requires vessels crossing a TSS to do so at right angles to the traffic flow. This minimizes the time spent in the shipping lane and presents a clear, predictable aspect to approaching ships — making it easier for them to assess the situation and take avoiding action if needed.

The pilotage plan should be prepared during passage planning, before departure. Trying to interpret a complex harbour approach while tired, in deteriorating visibility, or at night is when errors happen. A prepared plan reduces the cognitive load at the critical moment.

Tidal gates cascade — missing one delays you, which often means missing the next. A passage with multiple gates may have only one viable departure time per day that threads all gates correctly. Missing the first gate can cost 12+ hours waiting for the next cycle.

A bolt-hole you can't enter in bad weather or at the wrong state of tide isn't a bolt-hole — it's a harbour you can't reach. The best bolt-holes have all-tide, all-weather access with straightforward approaches.

A ship doing 18 knots covers a mile in under 4 minutes. In poor visibility, it may not detect a yacht until it's too close to avoid. Crossing in good visibility allows visual and radar detection at a distance that permits avoiding action.

At night, the visual landmarks that make a harbour approach straightforward by day are invisible. The navigator must identify the approach using light characteristics — colour, flash pattern, and sector. A pilotage plan with these details prepared in advance turns a disorienting night approach into a manageable sequence.

VHF is line-of-sight. From a masthead antenna on a yacht (typically 15 meters high) to a shore station antenna (typically 30–100 meters high), range is about 20–30 miles. To another yacht at sea, it may be only 10–15 miles. Beyond this range, SSB or satellite is needed.

SSB signals bounce off the ionosphere, which changes its reflective properties with sunlight. During the day, higher frequencies (8–12 MHz) bounce effectively. At night, the ionosphere lowers and lower frequencies (4–6 MHz) propagate better. Operators must select the right frequency for the time of day.

Iridium's constellation of 66 LEO satellites provides coverage from pole to pole — the only satellite phone network with true global coverage. Inmarsat and Globalstar have coverage gaps at high latitudes. Starlink is expanding but not yet fully global.

Automated tracking removes the need for crew action — positions are sent continuously regardless of crew fatigue, weather, or equipment priorities. If the track stops, it's a signal that the device has failed, the boat has capsized, or something else has interrupted the automated reporting — which triggers shore-based follow-up.

VHF signals travel in straight lines and cannot bend over the horizon. From a yacht's masthead antenna (15m) to a shore station (30–100m), the radio horizon is approximately 20–30 miles. Beyond this, the signal is blocked by the curvature of the Earth.

SSB's unique value is the cruiser net ecosystem — daily broadcasts where boats share positions and weather, net controllers relay forecasts and emergencies, and the community provides social connection. SSB email via SailMail is also far cheaper than satellite airtime for weather and email.

No communication system is 100% reliable — satellite devices can fail, SSB antennas can break, batteries can die. Two independent systems (e.g., Garmin inReach + SSB radio) ensure that if one fails, the other maintains the ability to report position and call for help.

One missed check-in is more likely a communication failure (flat battery, poor propagation, crew busy) than an emergency. The shore contact should try alternative methods (satellite phone, text, other crew members' devices) before escalating. The written communication plan should specify the escalation timeline.

An EPIRB has one function: transmitting a distress alert with GPS position when activated. A Garmin inReach provides daily position tracking, two-way text messaging, weather forecast requests, and an SOS button. The inReach is a routine communication tool; the EPIRB is a last-resort emergency device.

Tropical cyclone seasons dominate cruising calendars: June–November in the North Atlantic/Caribbean, November–April in the South Pacific. During these months, boats must be outside the cyclone belt, hauled out in a secure facility, or insured and prepared for a direct hit.

Seasonal circuits exist because they work with the weather rather than against it. They use trade winds for downwind passages, avoid cyclone belts during their active seasons, and position boats in the most favourable sailing conditions for each time of year.

Rallies provide structure and safety but at the cost of flexibility. The departure date is fixed (you can't wait for a better window), the route is predetermined (you can't divert to explore), and the arrival port is set. Independent sailors who value flexibility may find rallies too constraining.

The Panama Canal Authority requires 4 line handlers plus the person steering — a minimum of 5 people aboard during transit. Lines from each corner of the yacht control the boat's position in the lock. If you don't have enough crew, local line handlers can be hired at reasonable rates.

The Caribbean cruising season runs November to May, bookended by the Atlantic hurricane season (June 1 – November 30). Most cruising boats are either north of the hurricane belt, hauled out, or in the southern Caribbean/ABCs by June.

Seasonal circuits follow the weather. Moving south in autumn avoids winter storms in higher latitudes and positions boats in the trade wind belt during its most reliable period. Moving north in spring takes advantage of improving conditions and avoids the onset of tropical cyclone season.

March–April is the traditional window for the Pacific milk run. The SE trades are established, and the South Pacific cyclone season (November–April) is ending. Departing earlier risks cyclones at the destination; departing later may encounter less reliable trades.

The Panama Canal Authority requires vessel measurement (for fee calculation), a transit booking, adequate crew (4 line handlers + helmsman = 5 minimum), 4 mooring lines of at least 125 feet each, and adequate fenders. Missing any of these delays or prevents transit.

Rally adjacent means timing your departure with the rally fleet, following a similar route, and joining the SSB radio nets for weather and community — without the formal entry fee or schedule commitment. You get much of the safety and social benefit while retaining the flexibility to wait for better weather or change your route.

The 30% reserve covers scenarios you can't predict — extended calms requiring more motoring, emergency manoeuvres requiring engine power, or a passage that takes longer than planned. Running out of fuel offshore eliminates your most important backup system.

Clogged fuel filters are the number one engine stopper on cruising boats. Diesel bug (biological growth in fuel tanks), water in fuel, and sediment all accumulate in the primary fuel filter. Carrying spare filters and knowing how to change them at sea is essential.

Watermakers are mechanical systems that can and do fail — membrane fouling, pump failure, power loss, and clogged pre-filters are common. If the watermaker is your only water source and it fails on day 3 of a 16-day crossing, you have an emergency. Stored water is the backup.

Range = (200 ÷ 3) × 6 = 66.7 hours × 6 knots = 400 nautical miles in calm water. In a head sea, expect half this — about 200 miles — due to increased consumption and reduced speed.

Fuel consumption increases exponentially with RPM. At 60–70% of maximum RPM, the engine produces good speed with moderate consumption — the sweet spot for range. Going faster burns disproportionately more fuel for diminishing speed gains.

The minimum for drinking alone is 2–3 litres per person per day. In tropical heat or during strenuous activity, this increases. Cooking adds approximately 1 litre per person per day. The water budget must account for all uses plus a 25% reserve.

Starting rationing early means the daily allowance is only slightly restricted — the crew barely notices. Waiting until tanks are low means severe restriction that affects crew capability. Assign daily water bottles from day one and the math takes care of itself.

Manufacturer consumption data is for a new engine on a test bench. Your actual consumption reflects engine age, propeller condition, hull fouling, alternator load, and real-world conditions. Measuring your own consumption gives you the real number for passage planning.

The Q flag means 'I request pratique' — formal permission to enter the country. It tells authorities the vessel has arrived from a foreign port and has not yet been processed. Keep it flying until cleared, then lower it and fly the courtesy flag of the host country.

A zarpe (or despacho) is your exit paper from the previous country. Without it, the next port's officials can't verify you left legally. Arriving without a zarpe raises flags — it suggests you may have left without clearing out, which is illegal in most jurisdictions.

Cabotage laws protect domestic shipping industries by restricting foreign vessels from commercial operations between domestic ports. For cruisers, this means you cannot legally carry paying passengers between ports within the country — even if it's just friends contributing to fuel costs. Violations can result in vessel seizure.

Most Caribbean nations require firearms to be declared on arrival and surrendered to local police. They are held (usually at the police station) and returned when the vessel clears out. This is a standard procedure — undeclared firearms, however, result in criminal charges.

The Q flag is lowered after clearing in is complete. It is then replaced (or supplemented) by the courtesy flag of the host country — a small version of the national flag flown from the starboard spreader. Flying the Q flag after clearing in signals that you don't understand the protocol.

The zarpe (or despacho) is the official departure document. It proves you cleared out of the previous country legally and states your declared next destination. The next country's officials will ask for it as part of the clearing-in process.

In international waters and foreign ports, the vessel's flag state is the country, not the state. Some nations don't recognize sub-national registrations (like a US state registration) as valid proof of nationality. Federal/national registration (like USCG documentation) is accepted everywhere.

Cabotage laws prevent foreign-flagged vessels from competing with domestic shipping by restricting commercial activity (paying passengers, cargo) between ports within the country. Cruisers who take on paying crew or informally charter their boat between domestic ports risk severe penalties.

The golden rule: always declare. Most countries have a procedure for visiting vessels with firearms (typically surrender to police during your stay). Undeclared firearms, if discovered during a search, are treated as smuggling — a criminal offense that can result in imprisonment and vessel seizure.

The fovea is packed with cone cells optimized for daylight. At night, cones are nearly blind. Rod cells, concentrated in the peripheral retina, are 1,000 times more sensitive in low light. Looking slightly away from an object lets the more sensitive rods detect it.

A red light alone means you're seeing the port (left) side of the vessel — it's crossing your bow from left to right. Under COLREGS, if you're the give-way vessel (it's on your starboard side), you must alter course or speed. Red = port = crossing from your left.

An uncertain night approach with a tired crew is high-risk. Heaving to or drifting offshore until dawn is always safer than pressing into an unfamiliar harbour in the dark. Waiting costs hours; a grounding costs the boat.

The human circadian rhythm reaches its lowest point between 0200 and 0500. The body is programmed to sleep during these hours. Watch keepers are fighting biology — which is why the 0200–0500 watch is the most dangerous and why alertness strategies (standing, eating, scanning) are essential.

Rod cells in the retina take 15–20 minutes to reach full sensitivity after exposure to bright light. Any exposure to white light during this period resets the clock. This is why red lighting is used throughout the boat at night.

Seeing both red (port) and green (starboard) sidelights simultaneously means the vessel's bow is pointing at you — it's heading in your direction. This is the most important light combination to recognize because it indicates a potential collision risk.

Fl(2)15s means a group of 2 flashes repeated every 15 seconds. At night, you identify this light by counting the flashes in each group (2) and timing the period from the start of one group to the start of the next (15 seconds). This unique pattern confirms which light you're seeing.

AIS is invaluable at night but has gaps: not all vessels carry or activate AIS transmitters, small boats may not have them, and unlit objects (debris, containers, unlit fishing boats) are invisible to AIS. Visual lookout remains essential — AIS supplements it, doesn't replace it.

Physical activity (standing), protein and fat (sustained energy, not sugar spikes), hydration, and active engagement (binocular scanning) maintain alertness during the circadian low. Passive activities (sitting, listening) promote drowsiness. The goal is to keep the brain actively engaged.

The Earth is a sphere. A rhumb line (constant bearing) appears straight on a Mercator chart but is not the shortest path on a sphere. A great circle is the true shortest distance — it follows the curvature of the Earth. Over ocean distances, this difference can exceed 100 miles.

A 2-knot favourable current adds 48 miles per day. A 2-knot adverse current subtracts 48 miles per day. Over a 20-day passage, that's the difference between arriving on day 16 and arriving on day 24. Current exploitation is a critical element of offshore route planning.

In the open ocean, there are no rocks to avoid or channels to follow. Waypoints mark strategic positions — where you cross a current boundary, where you assess weather for the next leg, or where you should be positioned to catch the trade winds. They're decision points, not hazard markers.

Rallies provide organized support — professional weather routing, pre-departure safety inspections, daily communication nets, and the safety and social benefit of crossing with a fleet. For less experienced crews, this structure significantly reduces the risk of an ocean passage.

Over trans-ocean distances (3,000+ miles), the great circle can be 100+ miles shorter. For a boat averaging 6 knots, that's 16+ hours of sailing — nearly a full day. Practical routes compromise between the great circle's distance savings and the trade winds' reliability.

The Gulf Stream is a 2–4 knot current. Sailing with it (northbound) gains 48–96 miles per day. Sailing against it (southbound) loses the same. Additionally, wind opposing the Gulf Stream creates steep, confused seas — route planning must account for both the current advantage and the sea state risk.

Pilot charts compile decades of weather observations into monthly statistical summaries. Each chart shows what conditions are typical for that month in each region — prevailing wind direction and strength, average current, storm probability, and fog frequency. They're the starting point for seasonal passage planning.

Unlike coastal waypoints that mark fixed hazards, ocean waypoints mark strategic positions. If the wind pattern shifts — trades further south than expected, a high-pressure system repositioning — the optimal track may change. The waypoints are starting references, adjusted as weather evolves.

Crew capability matters more than count. Two experienced sailors who can stand watches, handle sails, navigate, and cook are better than five novices. Pre-departure discussions about watch systems, seasickness management, and expectations prevent problems that surface on day three at sea.

A passage plan includes context that a chartplotter route cannot capture: why the route was chosen, what hazards lie nearby, where to shelter, tidal timing, and decision criteria. The plotter shows where to go; the plan explains why and what to do when things change.

A crew that understands the route, contingencies, and decision criteria can continue safely even if the skipper is injured, incapacitated, or overwhelmed. The brief distributes critical knowledge across the crew.

Waypoints should mark meaningful navigation events — course changes, decision points, tidal gates, or assessment points. Arbitrary distance-based waypoints add clutter without value. Every waypoint should answer the question: why is this point on the plan?

The trigger is the action item — it tells the shore contact exactly when to raise the alarm and who to call. Without a clear trigger, the float plan is just information with no one acting on it. The trigger converts a document into a safety system.

A chartplotter route shows where to go. A passage plan explains why that route was chosen, what hazards lie nearby, where to shelter, what the tidal timing is, and what criteria trigger a change of plan. The context is what makes planning valuable.

The plan is built on assumptions — forecast weather, expected boat speed, tidal timing. During execution, the crew monitors whether these assumptions hold. When reality diverges from the plan, the plan's contingencies provide the framework for decisions.

If the autopilot is following waypoints, it steers directly toward each one. A waypoint placed on a rock, shoal, or headland means the boat is aimed at the hazard. Offset waypoints to give a safe passing distance.

The trigger converts the float plan from a passive document into an active safety system. It tells the shore contact exactly when to escalate and who to call. Without a clear trigger, no one acts on the information.

The 'what if' test checks whether the route is robust against realistic failures. If a 90-degree wind shift, loss of visibility, or engine failure on any leg puts the boat in serious danger, the route needs more sea room, a different track, or additional contingency planning.

Passage times are estimates. Lighter winds, adverse currents, equipment problems, or weather diversions can extend a 14-day passage to 18 days or more. Having reserve provisions means the crew stays fed and capable even if the passage takes longer than planned.

Bilge water, condensation, and the occasional wave intrusion will soak paper labels. They dissolve into pulp that clogs bilge pumps. Marking contents directly on the can with permanent marker is permanent, waterproof, and pump-safe.

Engine consumables — fuel filters, oil filters, the raw water pump impeller, and drive belts — are the parts most likely to fail or need replacement during a passage. A clogged fuel filter or a failed impeller can stop the engine when it's needed most (calms, charging, entering harbour).

Eating fresh food first and preserved food later follows the natural shelf life of provisions. Fresh produce and meat last 2–3 days without refrigeration, hardy vegetables and eggs last a week, and canned/dried goods last indefinitely. This progression maximizes food quality throughout the passage.

Heavy stores placed low reduce the centre of gravity, improving stability. Placing them centred (not biased to one side) prevents a permanent list. Water jugs, canned goods, and anchors go in the bilge or lowest lockers. Light items go high.

The inversion test asks: if the boat capsizes (180 degrees), will anything fly out of its stowage? Unsecured cans, bottles, and tools become dangerous projectiles in a knockdown. Locker nets, bungee cords, and proper packing keep everything contained.

25% reserve accounts for realistic delays — lighter winds, adverse currents, weather diversions, or equipment problems. A 14-day passage provisioned for 18 days means the crew stays fed even if the crossing takes four days longer than planned.

On an offshore passage, the boat is the hospital. If a crew member is injured or ill, professional help may be days away. A medical reference (like the Ship Captain's Medical Guide) provides diagnosis and treatment guidance that the crew can follow until the patient reaches professional care.

Boat maintenance consistently tops the cruising budget. Saltwater, UV, and constant use degrade everything — rigging, sails, engine components, electronics, bottom paint, through-hulls. Budget 10–15% of the boat's value per year, and expect to exceed it in years with major work.

Power management is the daily discipline of cruising life. Every system aboard — refrigeration, navigation, lighting, communication — draws from the same battery bank. Monitoring consumption, managing charging sources, and making smart decisions about power use keeps the systems running and the batteries healthy.

The morning radio net is where the cruising community operates — weather updates, social events, requests for help, and general information flow through the net. Introducing yourself on the net signals that you're part of the community and opens the door to connections.

After months or years of cruising, land-based life feels overwhelmingly fast, expensive, and disconnected from nature. Many returning cruisers experience a difficult 6–12 month adjustment. Planning for re-entry — maintaining some shore connections, having a financial plan — makes the transition manageable.

The industry guideline is 10–15% of the boat's value per year for maintenance. On a $100,000 boat, that's $10,000–15,000 annually. This covers bottom paint, engine servicing, rigging maintenance, sail repairs, and the inevitable unexpected failures.

In remote cruising areas, there are no marine mechanics, riggers, or sailmakers. The ability to diagnose problems and repair them with whatever is available — improvisation, creativity, and basic skills across all boat systems — keeps the cruise going when something breaks far from professional help.

A battery monitor shows real-time data: how full the batteries are, how much power you're using, and how much you're producing. Without it, you're guessing — and guessing leads to either over-discharging (killing batteries) or over-charging (wasting fuel running the engine needlessly).

Shipping to remote islands is expensive, unreliable, and subject to customs duties. Experienced cruisers accumulate parts orders and coordinate delivery to a major port (Papeete, Suva, Cartagena) where DHL/FedEx delivers reliably and customs is manageable.

The morning radio net is the community's central hub. Sundowner drinks are the social glue. Helping with maintenance projects demonstrates that you're a contributor, not just a consumer. These three actions — net, sundowners, helping — integrate you into any cruising community within days.

In standard 4-on-4-off, the same crew always has the 0200–0600 watch — the most fatiguing and dangerous hours. The Swedish system's dog watches (splitting one 4-hour block into two 2-hour blocks) shifts the entire rotation by 2 hours daily, so the miserable watches are shared.

Sleep research shows significant cognitive degradation after 3 days of restricted sleep (4 hours per night). By day 5, impairment is equivalent to legal intoxication. On a multi-week passage, this means the crew needs strategies to supplement watch sleep with naps.

The handover overlap ensures information transfer and adjustment time. Night vision takes 15–20 minutes to develop. The incoming watch needs to understand the current situation — course, weather, traffic, and any concerns — before they're responsible for the boat.

Meals at watch changes serve three purposes: nutrition (both watches eat), social connection (the only time the full crew may be together), and daily rhythm (providing structure that prevents the days from blurring into an indistinguishable haze of watches and sleep).

A crew of 4 divides into two pairs for a 4-on-4-off or Swedish watch rotation. A 3-watch system requires 6+ crew. With 4 crew, the Swedish variant (with dog watches) is preferred because it rotates the night hours fairly.

A complete handover brief covers everything the incoming watch needs to manage the boat: navigation (course, speed), environment (wind, weather trend, traffic), boat status (any issues), and orders (wake criteria for the skipper). Missing any element leaves the new watch uninformed.

The eyes' rod cells (responsible for low-light vision) take 15–20 minutes to fully adapt after exposure to bright light. This is why the incoming watch needs overlap time on deck — and why red lights are used below to preserve partial night adaptation.

A logbook with regular entries reveals patterns: a dropping barometer over 12 hours forecasts weather. Bilge pump entries every 20 minutes flag a leak. Declining speed over 3 watches suggests fouling or current. The logbook turns observations into actionable trends.

Sleep research shows that 20-minute naps significantly improve alertness, reaction time, and judgment. On a passage where chronic sleep debt is inevitable, napping supplements watch sleep and maintains crew performance. It only works when two people are on watch — one must be fully alert while the other naps.

A margin is essential because passage times are estimates. Adverse currents, lighter winds than forecast, or route diversions can extend the passage. If the window is just barely long enough, any delay puts you at sea when the next system arrives.

GRIB files are model output with limited resolution. They can miss local effects like land-sea breezes, headland acceleration, and current-wind interactions. They're an excellent starting framework but must be supplemented with local knowledge and real-time observation.

Written criteria decided in advance — before schedule pressure, crew frustration, and the desire to move take hold — turn the go/no-go decision from an emotional judgment into an objective checklist. If the criteria aren't met, you wait. No discussion needed.

November–December is the traditional window for the Atlantic crossing. The trade winds are established (providing consistent downwind sailing), and the Atlantic hurricane season has ended (November 30). Earlier departures risk late-season hurricanes; later departures may encounter less consistent winds.

A margin of at least 25-30% is prudent. For a 36-hour passage, a 48-hour window provides 12 hours of buffer for adverse currents, lighter winds, or route diversions. The severity of the closing system determines how much margin you need.

Weather models use different physics and data. When GFS and ECMWF agree on timing and intensity, confidence is high. When they disagree — especially about a critical system — planning should be based on the more conservative model.

Schedule pressure pushes sailors to rationalize marginal forecasts. 'It might not be that bad' and 'the crew has flights to catch' are the most dangerous phrases in sailing. Written go/no-go criteria decided in advance counteract this pressure.

Criteria set in advance — before pressure, frustration, and group dynamics take effect — are objective. Criteria set at the dock on departure morning are subject to rationalization. Write them down during passage planning, not during the departure decision.

By November, the Northeast Trade Winds are established (providing consistent downwind sailing), and the Atlantic hurricane season officially ends on November 30 (reducing tropical cyclone risk). This combination of favourable wind and minimal storm risk makes it the traditional crossing window.