Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very thorough coverage of global navigation, but has at least a few typos

This book packs a LOT of good information into its rather small size, and seems like every time I pick it up I learn something that I didn't know before. Very thorough and in-depth coverage of the subject - though (as another reviewer pointed out) some of it may be somewhat dated by now (LORAN-C, references to USSR, etc.), but it's still a good foundation for global air navigation.Be aware of at least a couple of typos in the book (there may be more, these are just the ones that I've found so far) for which I had to deduct one star from the rating:1) On page 124, under "Description of North Atlantic Airspace" - first paragraph line #5: The term "350 north latitude" makes no sense, should probably be "35 north latitude" (?).2) On page 292, Figure 15-5: The labels for Observer #1 are incorrect, "30 WEST LONGITUDE" should be "60 EAST LONGITUDE" (as the text on page 291 states correctly).