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As recently as 1995 the author came across a chart (still in use at the time) that differed from the WGS84 datum by about a half mile. The chart was based on a survey from the 19th century. Years ago, celestial measurements were the only way to determine your position at sea or a position far away from any well surveyed benchmark. How was the first benchmark even referenced? The answer is the stars. If a survey had to be made of a remote island or other region where referencing benchmarks was impractical, a surveyor had to consult the stars. In fact, the latitude and longitude from your GPS is based on astronomical measurements. While GPS has supplanted celestial methods in surveying and navigation, an appreciation for celestial sights and methods will help a person appreciate these older charts and surveys. An understanding of the celestial methods will also aid you in understanding how the GPS actually works.

From the Publisher

Cruising through Collapse: a Post Apocalyptic Adventure

Cruising through Collapse: a Post Apocalyptic Adventure

The nautical terms used in the novel are explained in the context. Paper copies of Cruising through Collapse also come with these line drawings to help the reader understand the boats shown on the cover art. You can purchase plans to build the balanced lug sailing dinghy used by the family in the book, as well as a technical book on the Celestial Navigation methods used by these post GPS survivors. Visit the Roy Timpe author page.

ASIN ‏ : ‎ B077ZG3MQR
Publication date ‏ : ‎ December 6, 2017
Language ‏ : ‎ English
File size ‏ : ‎ 11965 KB
Text-to-Speech ‏ : ‎ Not enabled
Enhanced typesetting ‏ : ‎ Not Enabled
X-Ray ‏ : ‎ Not Enabled
Word Wise ‏ : ‎ Not Enabled
Format ‏ : ‎ Print Replica