Global Positioning Systems (GPS)can "Know" Their Location by

question 36

Multiple Choice

Global positioning systems (GPS) can "know" their location by

• A)measuring the time required for radio signals from four or more satellites to reach the receiver.
• B)relating changes in detected radiation to changes in the position of the Sun.
• C)continually measuring changes in angle to a stationary reference point,such as a streetlight,in the area of the receiver.
• D)relating slight changes in magnetism and gravity to changes in the distance and direction of movement from the point at which the location of the receiver was last calibrated.