In a nutshell, I think this book wanted to be better than it turned out. There are many great topics that don't seem to get the thorough treatment they deserve. To cite just one example of this, turn to page 228 where the reader is instructed to "[p]lease review image 79." Image 79 depicts a small section of a topographic map showing dashed lines in white, red, and blue, as well as small green circles, small yellow circles and ovals, and blue ovals. This image is the topic of pages 228 to 231, but nowhere are any of those colors or symbols mentioned; if the accompanying text offers any hints at what is being conveyed, they are vague at best. This image is about 2 inches by 2 inches, which is about as large as most of the images in the book. To be fair, there are a few that are larger, but the images all tend toward the smaller side, often with fairly useless captions.
I'm not unfamiliar with the topic of navigation, but the first chapter felt like a bumpy and disjointed start for newcomers. Actually, it felt like quite a lot of the information presented throughout the book was a bit jumbled. Not enough to make it incoherent, but just enough to be mildly unsettling. I'll likely reread the first section again before I have to return it to the library to see if I can convince myself once and for all whether this is a book that might be worth owning--I found my opinion changing the whole time I was reading. I'd likely buy a used copy for cheap, just so I could mull it over for a while, but I don't see myself paying full price for a new copy.