If I have 2 carriers, let's say ... and I center location "A" on a carrier at anywhere ... if I center the location again, using the same parameters, will it go on the other carrier ? Or it keeps centering on the same one every time ?
Or does it depend solely on their position on the map ?
The carrier closest to the left side of the map will be centered on.
Bottom left side to be exact
Left takes priority over bottom. The one closest to the left side will always be centered on. If more than one are at the same horizontal position, the lower one will be centered on. People usually get around this by changing ownership of a unit when the location centers on it, but sometimes that's impossible.
And if you preplace units in one vertical line in staredit, then they are selected bottom to top (if you give or remove after the first, second, etc. so you can select the next one). If you place them in scmdraft or SF, the last unit you placed is selected first, and the first unit you placed is selected last.
That's mainly only an issue if you have grids with burrowed units, but I mention it anyway because it is the only exception to where left-most units are selected first and the bottom units are selected if in an exact vertical line.
--Closed and solved.