Broke just during playing. 0.002 2017-05-05 20:28:37; Factorio 0.15.8 (build 29493, win64, steam) 0.002 Operating system: Windows 10 (version 1511) 0.002 Program arguments: "C:\Program Files (x86)\Steam\steamapps\common\Factorio\bin\x64\Factorio.exe" 0.002 Read data path: C:/Program Files ...

+1 It will help a lot.

I think devs will add it, because the mod has about 9.500 downloads and it's very easy to do.

It's already implemented in mod called "Map Ping" and it would be nice to see it in vanilla.

Mod called "Flare Stack" adds it (would be nice to see it in vanilla).