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Much like when the green arrows show up when you click to move, even if you click on the mini map.
Sometimes I want to indicate specific positions to my teammates, but on the mini map it can be difficult to distinguish things close together. For example: the bushes against the wall in top and bottom lane, and the cluster of bushes near river entrance to each teams blue, the one closest to mid lane.
I'd imagine they would just be differently coloured arrows.
Blue (turquoise?) is advance.
Yellow is retreat / care.