I know that in their own way, navigators are psykers (uses the warp, can’t effect untouchable, anti-psyker weapons works on them as well etc.) though theoretically could a navigator be a true psyker?
I can’t find anything about it in the books and I don’t think it say that their warp eye prevents them from being a psyker.

It does say that the navigators are what they are because of the Navigator Gene. The Navigator Gene has been carefully cultivated, over the long history of the Imperium, which could prevent them from being psykers. But the navigators do gain mutations and I believe that the Psyker Gene is also a mutation. So theoretically could they become psykers? Maybe with extreme exposure of warp energy... I don’t know
what do you guys think?

I'm just quoting Lexicanum here.

"All Navigators have a third eye, commonly called the Warp Eye, on their foreheads, which allows them to perceive the "psychic light" known as the Astronomican, enabling them to fully use their powers in guiding ships through the currents of the Warp. Their ability to sense the tides of the warp is considered psychic, although Navigators never possess any psychic abilities beyond the powers their warp eye affords them ."

wh40k.lexicanum.com/wiki/Navigator

Now, it is important to note that this reference is attributed to the original 1987 version of Rogue Trader, so it may be considered out of date; but i was also under the impression that Navigators use their Warp Eye to interact DIRECTLY with the Warp, where the psyker CHANNELS the Warp through his/her own body through force of will.

Hope that helps.

ah I see... thanks

Into The Storm explicitly states that Navigators are NOT psykers.

The Navigator in Dead Stars has a Psy Rating and Psy Powers.

Peacekeeper_b said:

Certainly because there's no rules for creating Navigators in DH.

They're just said to be a particular type of psykers, in the core rulebook.

So including a Navigator in any book of the DH game line needs finding a way to emulate his powers according to DH rules or explaining to customers that they must buy another game.

Could Sorcerors and Farseers get navigator powers?

DarkLoic said:

Not true, as Nostromo's profile in Dead Stars doesnt even need any "Navigator" powers beyond his Warp Eye, and if they could add a paragraph trait to describe his warp eye in DH terms, then they could have added a paragraph describing his overall "navigatorness", not that they needed to, they just could have.

You can't "get" navigator powers, it is an artifical mutation that has been carefully cultivated over thousands of years. Only those born to a navigator house can have navigator powers.

However those psykers "allied" with the warp (or those that are just VERY powerful, alpha level) can often just make the warp to deposit them where they want. Basically teleportation on a large scale.

There is always the Dark Heresy Pact rules.