Flag Semaphore

communication · history · maritime · codes

Flags tell stories. Flag semaphore works by holding flags in specific positions to represent letters and numbers. Each position of the flags means something different, so you can spell out whole messages just by waving them around.

Ships at sea. Sailors adopted flag semaphore in the 1800s to talk to other ships when they were far apart on the ocean. Before radio existed, this was one of the best ways for ships to communicate with each other without getting close.

Beyond just flags. While flags are the most common tool, semaphore can also be done with rods, disks, paddles, or even just your bare hands. The key is that the position of whatever you're holding sends the message.

Day and night signals. Flag semaphore works great during the day when people can see the flags clearly. At night, sailors use lighted wands instead of flags so the signals are still visible in the darkness.

Still used today. Even with modern technology, the military and navy still teach and use flag semaphore for emergencies. It's reliable because it doesn't need electricity or radio waves to work.