The documentation states that you can select ships by their mark level or even by how much damage they have sustained, but it is unclear exactly what is supposed to be pressed to activate those. The docs state, for instance, "N + 1" will select MkI ships. I've tried the number pad numeral 1, and I've also tried holding down the "n" key and pressing either 1 from the regular number row and number pad, but nothing seems to do the trick.
Also, what exactly does this do? I was looking for a way of quickly filtering mark levels out of the current selection. With this shortcut will I be able to select, say, all Bombers and then use the shortcut to select only MkI bombers---or will it simply select all MkI ships on the planet?
Is there any way to do the latter with the keyboard? I know you can use the mouse to filter selection results off of the selection indicator button, but something keyboard related would be awesome.