The author, Mr. Greer, provides you with all the necessary aspects to start and even sustain your geomantic journey. Covering the story of its origins and the reading style of ancient times, the meaning of the figures, aspects, houses, methods of casting, meditation, magic... Really this is one great book and probably the one Geomancy book.
The author is clear, without delving into the obscurity or jargon of complex occultist terms, he explains everything he says and builds up in the preceding chapters. There's no feeling of uncertainty or the need to research for a better understanding of some concepts (although it is encouraged). Maybe the most "obscure" sections is the one devoted to geomantic magic, where the author makes use of Intelligences and Spirits, something that might be confusing for people not so learned in the occult arts.
The method is minimalist and very practical in all senses, from casting, to meditation and even manifestation, it is all simple, clear and straightforward. Even when dealing with materials, you just need anything that can give you a pair of random "symbols", from a stick in the sand, to a random number generator software. But all this does not come with a price, because the readings you can achieve with the 16 figures and their interactions is honest and deep at the least. And it is better if you add astrological meaning to the mix, you get a very unique and colorful, so to speak, method of divination.
The practice of Geomancy is really one of the most "occult" things I've tried to study, in the sense that it is one of the most difficult to research; the available information over the internet and even authors (at least digitally available) are scarce, something odd for one of the most interesting and versatile divination methods I have come across. But this book is the light on the path for sure.