TY  - BOOK
AU  - Kaplan, Elliott D.
AU  - Hegart, Christopher J.
TI  - Understanding GPS: principles and applications 
SN  - 1580538940
U1  - 623.893 
PY  - 2006///
CY  - Boston
PB  - Artech House
KW  - Global Positioning System
N1  - Includes bibliograpical references and index
ER  -