Kerbal Space Program

It is much easier to dock when using a 3rd party mod like
http://kerbal.curseforge.com/ksp-mods/220299-docking-port-alignment-indicator-version-3-1
however just having some basic indicators on the docking mode tools would avoid the need for installing a mod. Even better would be allowing it to be an unlocked item. Perhaps such instruments could be unlocked at much higher levels or pilot skill?