[aprssig] Public Icon Set (overlay location)

[Robert Bruninga]

One thing to consider is Overlay characters.



Originally in APRSdos the overlay characters were drawn over the symbol
itself and those symbols were drawn to have a clear spot in the center.



Then in the Kenwoods, we suggested placing the overlay character in the
upper left corner so that they could appear over any/all symbols.



In any new system I suggest 2 bits be allocated to indicate where the
overlay character is drawn.  Upper left, Upper right, center, or none.
 “None” can be used when a client that has defined a separate symbol for a
given overlay combo because it does not then also need to draw the overlay
character.  Though if there is room, it would help human understanding
across platforms if the overlay character was also obvious on the new
special symbol.



Bob, WB4APR
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