Customer Review: GPS uses General Relativity
[A review of the SECOND EDITION, 2005.] In the last 15 years, GPS has moved from an expensive and specialised application to a mass consumer market. There are numerous books on GPS; mostly directly at that mass readership. These typically concern how to use a device with a GPS receiver. By contrast, this book is meant for the engineer who has to design such a device. It is a compendium of technical papers covering many aspects you are likely to need. And undoubtedly some you won't, which should be reassuring. Because it means that you do not have to read all of this book for it to be useful. The sensitivity of the GPS satellites and the resultant GPS ground resolution is amazing, as can be appreciated from some of the papers in the book. Due mostly to the stability of the satellites' orbits and their onboard atomic clocks. Chapter 7 describes how GPS requires corrections due to Einstein's Theory of General Relativity! Not just Special Relativity. As a physicist, I found this fascinating. GPS is perhaps the first field where General Relativity is used, not to be tested, but as providing a necessary quantitative model for getting correct results. Akin to how Newton's Equations have been used for 300 years in ballistics. Granted, most readers will be engineers, who might find GR a trifle exotic. The book also has good coverage of the Russian GLONASS system. Perhaps for those who also want to use this for redundancy. Or to combine the signals from this with GPS for enhanced resolution.
Customer Review: Second edition in December 2005
If you are looking at the first edition, please note that the publisher plans to issue a second edition in December 2005.
You don't have to be a newspaper's restaurant reviewer to have tried the cuisine of most restaurants within your area. With more and more culinary cravers equipped with GPS in their own car or that of a dining partner's, getting to any great restaurant tucked away into an obscure, neighborhood location has become very easy.
When it comes to delicious food, the more the better. Whether having a ready range of restaurants and menus of a single style, or a smorgasbord of restaurants of nearly every style in your dining repetoire, finding the best meal or the best deal are two of every diner's delights. With a GPS device, really, your guide to the within-commutable world, getting to the restaurant or eatery of the moment is so simple.
After you get used to having our own GPS and have used it for a couple years, you really find that the several-or-so restaurants that you used to go to all the time become part of a much larger selection of great restaurants. Some people try a new restaurant each week, and have more fun doing so more often, and even more so, when including taverns and other spirit houses.
When on vacation and exploring a new location, finding the best hidden gems for your dining delight is a great way to have an even better time when on holiday. Whether or not you research all of your destinations before or during your trip, you can easily find the diamonds in the rough, or plan in a list of places to dine while away. If you love restaurants and don't have GPS, this is something to seriously reconsider. Click here to see some popular GPS devices
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