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An example is the Popham numeric code used at the Battle of Trafalgar. In yacht racing and dinghy racing, flags have other meanings; for example, the P flag is used as the "preparatory" flag to indicate an imminent start, and the S flag means "shortened course" (for more details see Race signals). Sailor prepares signal flags for operations at sea
What is now the International Code of Signals was drafted in 1855 by the British Board of Trade and published in 1857 as the Commercial Code. It came in two parts: the first containing universal and international signals, and the second British signals only. Eighteen separate signal flags (see chart) were used to make over 70,000 possible messages.
Code numbers 1–25 represented letters of the alphabet (omitting J and with V=20 before U=21); [8] higher numbers were assigned meanings by a code book. [9] The code numbers typically would have been hoisted on the mizzenmast , one after another, preceded by the "telegraphic flag" (a red over white diagonally-split flag) [ 10 ] to show that ...
This is a list of sail codes for sailing yachts and the old codes, used until 2000 by the International Sailing Federation. Mainsail Country Codes must comply with World Sailing Racing Rules of Sailing. ISAF Rules of Sailing Appendix G1.2 specifies that national letters shall be clearly legible and of the same color. [1]
Naval flag signalling undoubtedly developed in antiquity in order to coordinate naval action of multiple vessels. In the Peloponnesian War (431 – 401 BCE) squadrons of Athenian galleys were described by Thucydides as engaging in coordinated maneuvers which would have required some kind of communication; [1] there is no record of how such communication was done but flags would have been the ...
The Medieval and Early Modern Nautical Chart: Birth, Evolution and Use, Lisbon-based ERC-funded academic project. They develop and maintain the MEDEA-CHART Database, a sophisticated search engine and aggregator of early nautical charts data. Online version of Chart No.1 with "Symbols, Abbreviations and Terms" used in nautical charts
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Marks are shown on nautical charts, using symbols that indicate their colour, shape and light characteristic, and are usually identified by name or number. In a wider sense the phrase "sea mark" is often understood to include all types of landmarks, structures and devices that can be used to provide warning and guiding signs to mariners.