Start Signals and Flags

Start signals and flags are the visual means of communication between the race committee (RC) and the fleet. Knowing the meaning of each flag and the typical signal sequence leads to better tactical decisions at the start, avoids disqualifications, and helps you stay calm when races are postponed or restarted. This guide explains the most important regatta flags according to the Racing Rules of Sailing (RRS) and shows how they are hoisted in practice on the committee boat.

Why Start Signals and Flags Matter So Much

In regatta sailing there are no traffic lights and rarely direct radio contact with every boat. Instead, the RC communicates via flags at the masthead of the committee boat and via sound signals (horn, gong, gun). These signals are binding: they define when the preparatory period begins, when the start line is open, and what penalties apply to early starters.

For beginners, the variety of flags can seem overwhelming at first. Over time, experienced sailors recognize at a glance whether a race is being postponed, whether an individual recall is in effect, or whether the black flag is active. The tactician or helmsman should therefore make flag watching a fixed task – alongside timekeeping and position planning.

The Committee Boat and Signal Display

The committee boat usually lies at the leeward end of the start line. All relevant flags are hoisted there. At large regattas there is also an end boat on the windward side of the line; the start line runs between the two.

1. Main mast of the RC: This is where the class flag, preparatory flag, AP, recall flags, and abandonment signals appear.
2. Sound signal device: Horn or hooter confirms the hoisting or lowering of flags – one signal per minute in the standard start sequence.
3. Visibility: Boats must be able to recognize the flags without aids. In haze or heavy seas the RC uses larger flags or repeats signals.

Standard Start Sequence – Fleet Racing

The Most Important Regatta Flags at a Glance

World Sailing defines an international flag alphabet for sailing. Not every flag appears at every race – what matters is the class flag, preparatory flag, and the recall options chosen in the SI.

The Start Sequence Step by Step

In the classic Olympic start sequence (RRS Appendix H), the procedure is as follows:

1. Warning signal: Class flag is hoisted, one sound signal sounds. Five minutes until the start.
2. Preparatory signal: P up is hoisted, class flag remains. Four minutes left – boats position themselves.
3. One-minute signal: P flag is lowered. One minute until the start.
4. Start signal: Class flag is lowered, one sound signal. The start line is open; race time begins for each boat when it crosses the line.

During the last minute before the start, the line is "closed": boats that cross the line too early are considered early starters (On Course Side, OCS). Which penalty follows depends on the recall flag hoisted.

Recall Flags and Their Consequences

More on result abbreviations such as OCS, DNS and DSQ can be found in the article on DNF, DNS, DSQ and OCS.

race postponed, Abandonment and Course Changes

Not every signal relates directly to the start. Some flags inform about the overall status of the regatta:

AP – Answering Pennant (Postponement)

The AP flag (red and white striped) means: the race or the entire regatta day is postponed for an indefinite time. The fleet should wait until the RC gives a new warning signal. AP is often hoisted when the wind falls below the minimum limit defined in the SI or a thunderstorm cell approaches.

N and N over A – Abandonment

1. N flag alone: The race in progress is abandoned. Boats sail back to the area or the agreed rendezvous point.
2. N over A (AP under N): All races of the day are cancelled. No further start on that day.

S, M, C and Y – Course and Safety Signals

• S (Shortened Course): The course is shortened; the RC sets a new finish mark.
• M (Mark Replacement): A buoy mark has been moved or replaced.
• C (Change of Course): The entire course layout changes; often supplemented by radio or written instruction.
• Y (PFD Reminder): Reminder of life jacket requirement – not a start signal, but important for crew preparation.

Typical Regatta Day with Signals

Practice: Observing Flags Correctly

Experienced crews clearly divide tasks before the start. The tactician or a dedicated "flag watch" monitors the RC boat while the helmsman holds position in the fleet.

Checklist Before Every Start

• Sailing instructions (SI) read – which recall rule applies?
• Class flag identified – which flag signals our race?
• Stopwatch synchronized to warning signal
• Recall flag noted (I, Z, black flag or U?)
• RC radio channel set (if specified in SI)
• Position at leeward end of line planned
• Contingency plan for AP or general recall discussed
• Crew informed: who calls times and flags?

Differences by Regatta Format

Not all regattas use the Olympic 5-4-1-0 sequence. Match racing and team racing have their own signal procedures; with shore starts or line starts some flags do not apply. Large events such as Kiel Week or national championships sometimes deviate in the SI – for example with a shortened 3-2-1-0 sequence under time pressure.

Olympic and world championship formats increasingly use U-flag or black flag to enforce fair starts in large fleets. Club regattas more often use individual recall with the I flag because it is less harsh and offers beginners more tolerance for mistakes.

Recall Strategies by Experience Level

Common Mistakes and How to Avoid Them

1. Only watching the clock, not the flags: If the RC gives a signal late, the moment of hoisting counts – not your stopwatch.
2. Missing the recall flag: Black flag and U-flag fundamentally change start tactics. Without watching, you risk disqualification.
3. Confusing AP with abandonment: AP means waiting; N means abandonment. With AP the fleet stays ready to sail near the area.
4. General recall not recognized: Two sound signals directly after the start mean: everyone back, a new start follows. Those who sail far lose time and position.

Flag Knowledge in Crew Communication

Clear calls on board prevent chaos. Typical commands:

1. "P is up – four minutes!"
2. "P down – one minute!"
3. "Black flag beside P – careful in the last minute!"
4. "AP hoisted – back to the area, wait!"
5. "General recall – two horns, back to the start line!"

The helmsman and tactician should confirm flags and times aloud so the entire crew reacts in sync. Details on roles at the start can be found at Helmsman and Tactician.

Frequently Asked Questions About Start Signals and Flags

What does AP mean?

AP (Answering Pennant) means postponement for an indefinite time. The fleet waits until the RC gives a new warning signal.

What is the difference between I and black flag?

The I flag allows early starters to restart without disqualification. The black flag disqualifies boats that cross the start line in the last minute immediately and without the possibility of protest.

When does the last minute begin?

The last minute begins when the P flag (preparatory flag) is lowered – not at the warning signal.

What happens in a general recall?

In a general recall the entire fleet restarts. There is no penalty; the RC gives a new start sequence.

Is U-flag the same as black flag?

Yes, similarly – both lead to immediate disqualification for an early start in the last minute. However, the U-flag rule follows Rule 30.3 with its own flag form.

Summary

Start signals and flags are more than decoration on the committee boat – they are binding regatta language. Those who master AP, P, I, black flag, U-flag and the standard start sequence start more confidently, avoid unnecessary penalties, and react professionally to postponements. Read the sailing instructions before every regatta, assign flag watching within the crew, and practice signal sequences during training starts.

Related Topics

• Regatta Terminology – Terms, courses and abbreviations in regatta sailing
• DNF, DNS, DSQ and OCS – Result abbreviations and status codes explained
• From Start to Finish – Flow of a race from the start signal to scoring
• Morning Briefing and Course Briefing – Preparation before the first start
• Regatta Status and Abbreviations – Overview of all status codes and scoring systems