Hi guys,

well, everything is in the title. I took them as a psyker for roleplaying reasons, as my psyker has a bit of a dark side.

But the book doesn't go very far in explaining how these abilities can be used in the course of our missions. I once helped a pilot by sharing my warp-travel expertise, but that was the only time i could use it. And the occult stuff, i never had the occasion to use it, mostly because the description is rather vague in the book (i am new to the 40K universe).

Any thoughts?

It's really easy.

Warp is for all warp related. The knowledge of warp itself, what it is, how it works and the dangers therein. Psykers already know this. You can use to identify the cause for disturbances in the warp, it grants the knowledge on warp portals and how to use them with a semblance of safety, also the know of warp-related rituals, such as creating said portals. Identifying things warp-related and/or corrupted, and using them. If it's warp-related, you can use it to extract some knowledge. It's really rather broad.

But in dark heresy practice, you are unlikely to use it often or at all, unless you're dealing with chaos and accompanying warp problems.

Occult you can use for variety or reasons, such as identifying a particular cult, rituals, or anything (oc)cult-related. How to know the cult, it's practices and marks, a details of a profane rituals, and who may have performed a particular one. Also allows a perfomance of said rituals.

Also, there is a whole chapter of hints and tips about skills in the Inquisitor's Handbook. Page 224.