I'm beating on port and the boat just to leeward wants to tack but can't tack into me, so she shouts "Please tack!" — do I have to?
No. No rule makes a windward boat tack because she's asked. A "Room to tack" hail under Rule 20.1 only works when the hailing boat is approaching an obstruction, and wanting to tack isn't one. You can hold your course. But the leeward boat isn't stuck: under Rule 11 you must keep clear of her, so she can luff you, right up to head to wind, as long as Rule 16.1 gives you room to keep clear.
📖 Want Rule 11 in more depth? Elvstrøm Explains the Racing Rules 2025-2028 sets out every rule with plain-English explanations and diagrams. (affiliate link)
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<p><a href="https://sailing.kiwi.nz/v/WT9uGo8MjdE/">Source: Sailing Kiwi</a></p>Go deeper: books and gear
- Racing Rules Companion 2025-2028 by Bryan Willis — Spiral-bound pocket guide to the current rules.
- Elvstrøm Explains the Racing Rules 2025-2028 — Every rule, with plain-English explanations and diagrams.
- Five Oceans masthead wind indicator — See the wind direction at a glance.
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