TY  - BOOK
AU  - Gray,Leon
TI  - How does GPS work?
T2  - High-tech science
SN  - 9781482403930
AV  - G109.5 .G734 2014
U1  - 910/.285 23
PY  - 2014///
CY  - New York, NY
PB  - Gareth Stevens Pub.
KW  - Global Positioning System
KW  - Juvenile literature
KW  - GPS
KW  - Navigation
N1  - Includes bibliographical references (p. 47) and index
ER  -