Windrose Boarding vs Sinking: When Is It Worth It?

Windrose boarding (boarding a boat while it is moving forward) is worth it when the boat can maintain steerage and the person boarding is fit and experienced; sinking boarding (boarding from a stationary position) is safer for most situations, especially with children, elderly, or in rough conditions. This article explains the difference, when each method makes sense, and the risks involved.

Formula

The calculator works out how far the boat travels while you board, based on the boat’s speed and the time it takes. The formula is:

Distance (m) = Boat speed (knots) × 1852 / 3600 × Time (seconds)

• Boat speed – speed of the boat through the water in knots (1 knot = 1 nautical mile per hour = 1852 meters per hour).
• Time – how long the boarding maneuver takes, in seconds.
• Distance – the horizontal distance the boat moves during that time, in meters.

The second output gives the boat speed in meters per second, which is useful for judging how fast the deck is moving relative to the dock or swim platform.

Worked Example

Using the default values: boat speed = 3 knots, time = 10 seconds.

1. Convert knots to meters per second: 3 × 1852 = 5556 meters per hour; 5556 / 3600 = 1.543 m/s.
2. Multiply by time: 1.543 × 10 = 15.4 meters.

So the boat travels about 15.4 meters while you board. That’s a significant distance – if you slip, you’re in the water far from where you started.

What Is Windrose Boarding?

Windrose boarding (also called “windrose transferâ€� or “moving boardingâ€�) is a technique used mainly on sailboats and some powerboats where the boat keeps moving forward slowly (usually 2–4 knots) while a person steps aboard from a dock, dinghy, or another boat. The name comes from the windrose compass rose, but the technique is really about using the boat’s forward motion to maintain steerage and control.

The idea is that a moving boat is easier to steer than a stationary one, especially in wind or current. When the boat is stopped, it tends to drift sideways, making it hard to hold position next to a dock. By keeping way on, the helmsman can use the rudder to hold the boat alongside while the boarding person steps across.

When Is Windrose Boarding Worth It?

Windrose boarding is worth it in these situations:

• Strong wind or current: If the boat is being pushed off the dock, keeping way on helps the helmsman maintain position.
• Single-handed docking: A solo skipper can keep the boat under control while a passenger boards, without needing to tie lines first.
• Dinghy transfer at anchor: When picking up someone from a dinghy in choppy water, a slow moving boat creates a smoother lee (sheltered side).
• Experienced, agile boarders: If everyone is comfortable with the motion and can step confidently, it’s faster than a full stop.

However, it is not worth it when:

• Children, elderly, or anyone with limited mobility are boarding.
• The gap between boat and dock is large or the surfaces are slippery.
• The boarding person is carrying gear, pets, or is tired.
• There is any doubt about the helmsman’s ability to hold a steady course.

What Is Sinking Boarding?

“Sinking boardingâ€� is a less common term, but it generally refers to boarding a boat that is stationary, often with the engine in neutral or off. The boat may be tied to a dock, anchored, or held by a stern anchor. The name might come from the idea that the boat is “sittingâ€� low and still, like a moored vessel, or from a misconception that a stopped boat sinks slightly (it doesn’t – displacement stays the same).

In practice, sinking boarding means the boat is dead in the water. The helmsman has no steerage, so the boat will drift with wind and current. This is fine when tied up, but risky when trying to hold position alongside a dock without lines.

How to Choose: Windrose vs Sinking

Here’s a practical decision guide:

1. Assess the boarding person: Are they physically steady? Do they understand the motion? If not, choose a full stop.
2. Assess the conditions: Wind over 10 knots or current over 1 knot makes a stopped boat hard to hold – windrose may be the only way to stay alongside.
3. Assess the dock: Is there a cleat or line within reach? If you can grab a line quickly, you can stop the boat and board safely.
4. Communicate: The helmsman must tell the boarder exactly when to step. A common signal is “step now� as the boat comes alongside.
5. Have a backup plan: If the boarder hesitates or slips, the helmsman should be ready to throttle up and circle around for another attempt.

Common Problems and Misconceptions

One common misconception is that windrose boarding is always dangerous. It’s not – it’s a standard technique in many maritime contexts, especially in the Mediterranean where boats often moor stern-to. The danger comes from misjudging the speed or the gap.

Another issue is that people confuse “windroseâ€� with “windwardâ€� – windrose refers to the compass rose, not the wind direction. The technique works best when the boat is moving slowly and steadily, not when it’s surging or pitching.

A frequent problem is that the boarding person tries to step onto the bow or stern, which moves more than the midship. The best boarding spot is near the helm or the midship cleat, where the motion is least.

Safety Tips for Both Methods

• Always wear a life jacket when boarding from a dock or dinghy.
• Use three points of contact (two hands, one foot) whenever possible.
• Step onto the boat, not onto a line or fender.
• Never jump – a moving boat can push you backward.
• If you fall in, the boat should be put in neutral immediately.
• For sinking boarding, make sure the boat is properly tied or anchored before anyone steps aboard.

Frequently Asked Questions

Is windrose boarding legal?

Yes, it’s a normal boating maneuver, not regulated by law. However, the skipper is responsible for the safety of everyone aboard, so if someone is injured, the skipper could be held liable.

Can I windrose board alone?

It’s possible but not recommended. You need someone at the helm to control the boat while you step aboard. If you’re alone, use a spring line or a stern anchor to hold the boat still.

What’s the maximum safe speed for windrose boarding?

Generally, 2–3 knots is safe for a fit adult. Above 4 knots, the boat moves too fast to step aboard safely, and the risk of falling between boat and dock increases dramatically.

Does windrose boarding work with a powerboat?

Yes, but it’s easier with a sailboat because the hull shape and keel provide more stability at low speed. Powerboats with planing hulls may have less steerage at slow speeds, so practice in calm conditions first.

What should I do if someone falls during boarding?

Shout “man overboard,â€� put the engine in neutral, throw a life ring, and keep visual contact. Don’t reverse – you could hit the person. Circle back slowly and pick them up from the lee side.

Is it better to board from the dock or from a dinghy?

From a dock is easier because it’s stationary. From a dinghy, the dinghy moves with the waves, so you need to time the step with the wave motion. Windrose boarding from a dinghy is more advanced and should only be attempted by experienced boaters.

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in t | Time to board (seconds) | s | 10 | 1 | 120
in v | Boat speed (knots) | kn | 3 | 0 | 20
out distance | Distance traveled while boarding | m | (v * 1852 / 3600) * t | 1
out speed_ms | Boat speed (m/s) | m/s | v * 1852 / 3600 | 2