Alpine HCE-100XM - XM Radio Data Receiver Owner's Manual download pdf (Page 99)

Preface

Locations where GPS signals are received easily

Locations where GPS signals cannot be received

In the following locations or conditions GPS signals cannot be received. However even in

these locations, the gyroscope and speed sensor will provide a substitute means of

determining the vehicle’s position and the system will be able to continue to track the

vehicle’s progress along the route.

The optimum locations for receiving GPS

signals are locations that command a

good view where there are no tall

buildings, trees, or other objects to

obstruct the signals.

In tunnels and indoor

parking lots

Locations surrounded

by tall buildings

Locations surrounded

by tall trees

On the bottom level of

double-decker motorways

When a GPS satellite is low on the horizon (angle

below 10°), obstructions sometimes make normal

reception impossible

Gyroscope

The gyroscope is a sensor that accurately

measures the angle by which the direction of

a vehicle or other moving body changes.

Gyroscopes are used in inertial navigation

systems for airliners and ships. In this

navigation system, the gyroscope is used

together with the speed sensor, making it

possible to display the position of the vehicle

even in locations where GPS signals may be

blocked.

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Alpine HCE-100XM - XM Radio Data Receiver Owner's Manual Page 99