by David Burch Once we have learned to navigate by conventional methods using all available equipment in all circumstances, the task of the prudent navigator reduces to learning about weather and how to navigate with only limited instruments or none at all. This book teaches the latter subject. In the twenty years now that this book has been published, we have not learned of techniques or principles that should be in it that aren't, nor do we have any reason to believe that anything in it is wrong - which we are happy to report since this book took some six years to produce. The second edition adds a few things we learned over the years and updates changes that took place around us.