Fallout 4 - V.A.N.S... What Does It Do? Why Would Anyone Want To Take/Use It? [Explanation with Example]

I saw someone ask this in the Official Steam Forum, wondering why someone would even pick the VANS Perk (the Skill to use it) while levelling. I wanted to come back here and post, as a Quick Tip perhaps, a short explanation on what V.A.N.S. actually does (and how it can be helpful to players).

Briefly summarized, V.A.N.S. is a Perk of Intelligence (requiring only 1 INT to Unlock) that lets the V.A.T.S. interface 'show you the way' to your marked objective/quest/mission location. An example I recorded of how it looks, is below:

Recorded aboard The Prydwen, this is a short example of how VANS looks in Fallout 4.
(Reduced size, framerate and quality, to fit Upload requirements at Steam)
Click to see slightly larger Full Size

On Steam, at http://steamcommunity.com/sharedfiles/filedetails/?id=966498722

To use V.A.N.S., simply hold the Hotkey for opening VATS for a short time (eg. on PC, instead of hitting 'Q' quickly once, to enter V.A.T.S., hold it down) - let go of the 'Q' key, after about two full seconds or so - even if the Pip-Boy has not fully opened yet. Then hit 'TAB' to close the Pip-Boy right away, once the 'green trail' is seen.
You do not need to move or turn at all, until after closing the Pip-Boy fully (for example, I do not use the mouse at all to use V.A.N.S., on PC, I just open the Pip-Boy with 'Q' and close the Pip-Boy with 'TAB').
[Perhaps this will help those having issues with opening/closing/viewing the 'trail'...]

If you've played Skyrim, it is similar to the Clairvoyance Spell in that game, as it will then illuminate a 'trail' that looks like a tube of smoke along the ground, that you can follow (but in Fallout 4 it is 'Pip-Boy Green', as opposed to 'SKYrim Blue').

While this doesn't seem needed as Fallout 4 has both Map Marks (on the Map in the Pip-Boy and at the bottom of the Screen in a Compass) and Floating Markers (that can be seen on Doors, above NPCs, etc). V.A.N.S. is helpful in a slightly different way. It shows you the 'Main Path to take' to get to your Marked Objective/Quest/Mission (as in, "go to this Street and use this Road").

For example, if you are jumping around in the back hills or lost in the skyscrapers of Downtown, it will guide you out of where you are with the 'green steam trail' and show you how to get back to the main roads, then it will illuminate which way to go from there, too.

The Map Markers that are normally available only show the 'overall' or 'general' Heading, like a Compass (N, E, W, S) and not 'how to go around this thing in front of you' or 'how to get back to the main road first'. Those last concepts are where the usefulness in V.A.N.S. shines; in how it can guide you from exactly where you are, first around whatever is in front of you (to the nearest main path), then how to go on from there to your next objective.

Try it out on your next Character perhaps - and have fun in Fallout 4!