NavHud provides a new(ish) navigation instrument: A Heads Up Display showing you precisely what way your spaceship is pointing. It also features the target, normal, radial, retro/pro-grade, maneuver and docking alignment indicators.
Alignment indicator:
When targeting a docking port a target alignment indicator is shown. indicating the orientation of the targeted docking port.
Customization:
The color and size of the markers and lines can be changed in the window. The changes are saved in the file [KSPfolder]\GameData\NavHud\Plugins\PluginData\NavHud\config.xml
Toolbar:
This mod is compatible with Blizzy78's Toolbar.
Installation:
Copy the content of the 'GameData' folder to the 'GameData' folder of your KSP installation.
More info:
KSP forum thread
GitHub page