Another excellent addition to Rogue Trader, detailing the mysterious lives of the Navigators, their noble houses, and how their kind is critical for space travel. We also get a detailed look at other psykers, such as Astropaths and their Choirs, and Weirdboyz. The intricacies of space travel are detailed, with various tables that can help determine - or mess up - a warp jump. Such is space travel in Rogue Trader. Of course Warp travel is not an exact science, and we are given insight into the omens and rituals captains and their crew entertain. We even get a cool map that shows how the Warp space tides flow and swell. We also get a look at the renegade tech priests - the Acolytes of Abraxas, and other advanced careers. As always the art work is excellent.

The Navis Primer is an excellent addition if you want to give your space adventuring more depth, and your Navigator players more to chew on.

I think this is a great book. It covers some very in depth rules on navigating the warp and astral telepathy. Which no doubt most GM's will be happy with. It has some extra careers for most explorers and new powers and ship to ship skills for astropaths and navigators. Some of the powers seem a little under-powered compared to what is already out there. However, they certainly have good roleplay aspects to them. A few xenos psykers are covered (with powers, equipment etc) and enemies of psykers. Although there isn't a huge amount of new explorator equipment there is an excellent section on familiars including creating your own.

In short this book is a must for GM's & psyker players (or wannabe psyker players.)