The purpose of the Late Roman Draco standard.

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... and that there must have been a reason for this other than the Draco being a signalling device as stated by Vegetius (although, having served in the armed forces myself I fail to see how such a standard would be used in a signalling role, waving it about would appear to be a complete and utter nonsense!).

The development of semaphore I believe, came from a simple but effect use of flags (perhaps dracos too) and timings delays between signals to send a coded message...I don't think it should be dismissed so lightly.

Nor do I think field signalling and static location signalling would be necessarily different to avoid confusion.

This has some interesting points...(not that I agree with all of it!)

http://www.theromangaskproject.org.uk/P ... lling.html