I rate this book as a lucky chance find. Just about every page is packed with useful information. It covers it's subject comprehensively in a readable style, interspersed by interesting facts e.g. the original definition of a (Roman) mile.
Many books on navigation assume background knowledge, which may not always be available. Starting with basics including mapping conventions and grid reference systems, it goes on to give very detailed and valuable coverage to quite an advanced level. Use of handheld GPS instruments is thoroughly explored. The emphasis is on terrestrial navigation though coastal and maritime topics are also thoroughly described. The only significant and deliberate ommission is astro-navigation with a sextant, which would be of historical interest only to the great majority.
The book continues with very practical advice on survival planning, search & rescue procedures, and tracking. Lastly there is an chapter on escape and evasion which I hope will remain interesting theory to me!
In summary, a valued and interesting book which deserves to stay in print for a long time.