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One or more flags form a code word whose meaning can be looked up in a code book held by both parties. 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 ...
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]
Tactical number - a number painted on the hull of a military ship, for identification either during combat or peacetime. [1] [2] [3] Sail number - unique identifiers used especially for racing yachts but also windsurfers, and displayed on the sail to assist with search and rescue operations. The sail code prefixes are mandated by World Sailing.
The combination of symbol and hull number identifies a modern Navy ship uniquely. A heavily modified or re-purposed ship may receive a new symbol, and either retain the hull number or receive a new one. For example, the heavy gun cruiser USS Boston (CA-69) was converted to a gun/missile cruiser, changing the hull number to CAG-1. Also, the ...
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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.