Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. As defined by FS-1037C, radiodetermination is the determination of the position, velocity and/or other characteristics of an object, or the obtaining of information relating to these parameters, by means of the propagation properties of radio waves. There are two main fields to radiodetermination: radiolocation, which is mainly passive radionavigation, which is mainly active. This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C". Federal Standard 1037C, titled Telecommunications: Glossary of Telecommunication Terms is a United States Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. This document provides Federal departments and agencies a comprehensive source of definitions of terms used in telecommunications and directly related fields by international and U.S. Government telecommunications specialists