ORIGINAL: rustysi
I don't think it was ever implemented, but I think the developers wanted the the AMc to sit in port, and self sortie if a minefield was laid at the home port.
This is exactly how to use them. Yes, it works, all you need is to have one in port. It'll activate when needed sweep the minefield and deactivate all behind the scenes.
Thanks for pointing this out, have always put them in local minesweeping TF's with a reaction of 1.