30 semaphore characters are presented as they would appear when facing the signalperson:

Numbers can be signaled by first signaling "Numerals". Letters can be signaled by first signaling "J".

The sender uses the "Attention" signal to request permission to begin a transmission. The receiver uses a "Ready to receive" signal not shown above to grant permission to begin the transmission. The receiver raises both flags vertical overhead and then drops them to the rest position, once only, to grant permission to send. The

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