This mod adds a part to KSP that provides a window for planning trips between any two bodies in the system, including between two moons, or from a moon to a different planet.


Protractor v2.4.5 (updated 2/11/14) – compatible with KSP v. 0.23 (and added to tech tree for campaign mode!)

See the forum link below for video walkthroughs and more information.

I do not regularly check these comments. The best way to reach me is in the KSP forum thread for the mod:


This game uses the directory structure introduced by KSP v. 0.20. Unzip the Protractor folder to your GameData folder in the main game directory. The resulting path should be ...GameDataProtractor...

How to use

See in-game manual by clicking "?" symbol. Video walkthroughs are available in the thread for the mod located here:


33 Comments for “Protractor”

  1. This mod is great.

    queeb December 1, 2012
  2. Excellent tool!

    mothcity December 1, 2012
  3. 5 star mod for me. Protractor is still a crucial mod, especially for calculating launch windows.

    SimonJames1975 December 1, 2012
  4. This is the best way to efficiently move from one planet to another. If you’re an advanced user, you can even use it to go from any moon to any planet! A lot of blood, sweat and code went in to making this, and it shows. A must have, right up there with mechjeb.

    Hadlock December 1, 2012
  5. This thing really helped me get to JOOL!

    jacob December 5, 2012
  6. Would be nice if I could move the icon on screen. Where it sits at the moment forces me to move other UI elements to places where they obscure more of my in-game view.

    fnordianslip December 21, 2012
  7. Does this still work with 18.2? Maybe I’m blind, but I don’t see any UI changes when I install the plugin.

    zane December 23, 2012
  8. zane, it’s actually a part you attach to your ship. I believe it shows up under the ‘science’ category? Once you put it on your ship, you’ll see the UI for it pop up.

    g_audio December 28, 2012
  9. Does this work with 0.18.2? I have the plugin installed and the part equipped on my ship but the UI for it doesn’t pop up

    Kudan December 29, 2012
  10. not working with 18.2 – i have icon of calc and sometimes menu appears, but it’s not working, you can click it to eternity and nothing happens (

    mstdk January 10, 2013
  11. The mod works for .18.2, I just hadn’t updated the description in a long time.

    mstdk, delete the config.xml file from PluginData\Protractor and see if that fixes it. Also, make sure to only have one protractor on the ship (this will be fixed in a future update).

    If that doesn’t fix it, head to the KSP thread (URL is in description) and I’ll help sort it out.

    Enigma January 13, 2013
  12. This mod is very useful !

    I have just one question : what does that mean when thre is no value in “Phi” column ?
    (i was orbiting Jool and wanted to orbiting tylo and there was no value in “phi” column…)

    Calcaneus February 3, 2013
  13. This is junk. It says it gets you “in the neighborhood.” As in, just close enough for no intercept without wasting tons more fuel and delta-V trying to actually get an intercept. I had better results holding a paper circle protactor to my screen.

    millions-x February 27, 2013
  14. millions-x, if you’re having difficulty using the mod, I would be more than happy to assist you. Please post your concerns in the thread for the mod here ( and I would be happy to show you how to use the mod to achieve better results than a paper circle.

    Enigma March 2, 2013
  15. Hi,
    what does it actually do?

    Connor March 18, 2013
  16. Why does this have only two stars?

    Connor: It provides info on when to transfer to another planet or moon.

    Panichio April 7, 2013
  17. Well as far as I know, Mechjeb is providing the same info no? I’ve seen this mod on someon’s stream, but it looks like a waste in case you have that damned mechjeb.

    elkar April 15, 2013
  18. @ elkar mechjeb does NOT show the same info as this mod will. mechjeb will only calculate planetary phase angles, that’s only one of three data points you need for a decent injection.
    This mod imo is a MUST HAVE for novice and expert spacepilots alike. Time saving, effective, and Ive gotten much much better approaches than calculating angles off the map screen.

    Randy Fuessel May 5, 2013
  19. Has the issue with multiple protractors been fixed yet?

    Carl Oglesbee May 6, 2013
  20. Carl Oglesbee: Yes, I fixed that issue several months and versions ago.

    Enigma May 14, 2013
  21. Does anybody have issues with this Mod causing the game to sometimes freeze or not let you “end a mission” after you crash? when ever i put one of these on my ship in version .19 or .20 (yes i updated the protractor) it workd fine but if i crash it wont let me “end” or go back to base. i always have to close the game and restart it externally. I installed it the same way i have installed my many other mods….someone help please!

    scott armstrong May 24, 2013
  22. scott: this isn’t an issue with Protractor, necessarily. I had the same thing happen to me, and I’m not using it. When I had a ship-to-ship crash immediately after docking, everything disappeared and I was left unable to move the camera or back out of the mission in any way.

    Check your logs, I’ll bet you’ll find something has gone south because of a misplaced mod file.

    C Mack May 25, 2013
  23. So does this mod still work ok with 0.20?

    Nigel Stutt May 27, 2013
  24. Yes, it was updated the day 0.20 came out.

    Enigma May 28, 2013
  25. Fantastic mod! Why is this only 3 star?

    mk78123 June 3, 2013
  26. Personally, it would be more useful if it gave us time to burn when going from a planet to a moon of that same planet. Though really Mechjeb or Lazor systems give you the same information.

    cainfortea June 5, 2013
  27. why the heck does this only have 3 stars? incredibly useful tool for interplanetary travel.

    squisher0 June 6, 2013
  28. Ignore the 3 stars and get this mod if you like scheduling interplanetary travel by hand. Unless you enjoy finagling the camera to be exactly normal to your orbit’s plane and then literally putting a protractor up to the screen this is the tool to have.

    Martin Wilson June 8, 2013
  29. I can’t update ksp past 18.2 on my computer. WHen i tried to update it crashed my ksp so i had to restore from the backup i did the day before and lost all the mods. Including this one. Can you possibly give me a link to an 18.2 version. (Already Tried the updated version in 18.2 it would not go past loading screen)

    Jayozzy00 June 20, 2013
  30. Jayozzy00:

    This version should work for .18.2. I can’t promise the link will be up forever, so back up the zip.

    Enigma June 23, 2013
  31. When I have this addon loaded I can’t see the map :(

    If I’m on a ship then I hit “M” I just see a star field and I never see my orbits or the planets or anything… Any Idea;s?

    Scott Iver July 6, 2013
  32. Scott, were you able to resolve this by removing the ISA Mapsat dev build as we discussed in the Protractor forum thread?

    Enigma July 15, 2013
  33. Thankyou!:)

    irpded rogert July 30, 2013
  34. Hey guys, I’m having issues with the latest 0.23…
    Will there be any updates in the future or should I start getting used to another mod /: ?

    Geoffroy Lesage January 22, 2014

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