There are ways to compensate for this. First, the signaller could repeat the message on a loop. So, even if you only first notice half way through, you will eventually get the full message if you keep observing. Second, there are signals to indicate that you wish to communicate. On ships, for example, the signaller could repeatedly signal the others ship’s call sign. The observer would respond by signalling the other ship’s call sign. Once that exchange is complete, the signaller could send the full message. If you don’t know the call sign, there are generic symbols for “hey pay attention” and “yeah, i’m paying attention”
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