Signals can be sent by flaghoist, signal lamp ("blinker"), flag semaphore, radiotelegraphy, and radiotelephony. The International Code is the most recent evolution of a wide variety of maritime flag signalling systems.

In maritime communication, the letter Sierra (S) flag signifies “I am operating astern propulsion.” When this flag is raised, it indicates that the vessel is using its astern propulsion to move backward. It serves as a clear visual signal to nearby boats, informing them of …

International maritime signal flags are various flags used to communicate with ships. The principal system of flags and associated codes is the International Code of Signals. [1]

This International Code of Signals flag Sierra has a blue square centered on a white field and represents the letter S. Free to download and print

S-Sierra Individual Nautical Code Signals are available in a variety of sizes and three attachment options; Ash Toggle, Brass Snaps and Rings and Brass Grommets.

The SIERRA International Code Flags are made to official U.S. Navy regulations (NTP-13). They feature high grade nautical nylon fabrics, Bright colors, and made for the most harshest sea enviornments.

About this item 18"x12" (45cm x 30cm) Ministry of Defence Standard Woven and Knitted Polyester Flag Hems Are Double Stitched On All Sides Complete with Rope and Toggle Suitable for external use

Product Description A fully Sewn Military of Defence Standard Polyester Signal Flag with Rope and Toggle

Signal Flag Letter S (Sierra) Phonetic Pronunciation: see-AIR-ah Navy Meaning: Conducting flag hoist drill. International Meaning: Moving astern. International Code of Signal Flags have double stitched seams, finished nylon rope distance lines and ash toggles.

S - Sierra Code Flag, complete with loops and clips for easy flagpole installation. This flag is fully sewn with appliqued design, and is 750mm x 600mm in size. We can make flags to your specifications including custom designs, sizes, or finishes. Contact us for a quote.