Alpine INE-W970HD Navigation User Manual - Page 64

Reference guide

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5 Reference guide The following sections describe the different concepts and menu screens of Alpine navigation. 5.1 Concepts The following sections describe and explain navigation-related concepts. 5.1.1 2D/3D GPS reception The GPS receiver uses satellite signals to calculate its (your) position and needs at least four signals to give a three-dimensional position, including elevation. Because the satellites are moving and because objects can block the signals, your GPS device might not receive four signals. If three satellites are available, the receiver can calculate the horizontal GPS position but the accuracy is lower and the GPS device does not give you elevation data; only 2D reception is possible. Several factors have an impact on the deviation between your real position and the one given by the GPS device. For example, signal delay in the ionosphere or reflecting objects near the GPS device have a different and varying impact on how accurately the GPS device can calculate your position. 5.1.2 Road safety cameras and other proximity Alert Points There is a special proximity warning for road safety cameras (like speed or red light cameras) and other proximity Alert Points (like schools or railroad crossings). These Alert Points are preloaded in Alpine navigation. The application can warn you when you approach road safety cameras like speed cameras or dangerous areas like school zones or railroad crossings. You can set up the different alert types individually in the Warnings settings, see page 74. The following warning types are available: • Audio warning: beeps are played while you are approaching one of these points, or extra alert sounds if you exceed the given speed limit while approaching. • Visual warning: the type of the Alert Point, its distance and the related speed limit appear on the Navigation view while you are approaching one of these locations. For some of the Alert Points, either the enforced or expected speed limit is available. For these points, the audio alert can be different if you are below or above the given speed limit. • Only when speeding: The audio alert is only played when you exceed the given speed limit. • When approaching: The audio alert is always played when approaching one of these Alert Points. In order to draw your attention, the alert is different when you exceed the speed limit. The warning for road safety cameras is usually disabled when you are in a country where road Note! safety camera warnings are prohibited. Make sure that using this feature is legal in the country where you intend to operate. Use it on your own responsibility. 64

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5 Reference guide
The following sections describe the different concepts and menu screens of Alpine navigation.
5.1 Concepts
The following sections describe and explain navigation-related concepts.
5.1.1 2D/3D GPS reception
The GPS receiver uses satellite signals to calculate its (your) position and needs at least four signals to
give a three-dimensional position, including elevation. Because the satellites are moving and because
objects can block the signals, your GPS device might not receive four signals. If three satellites are
available, the receiver can calculate the horizontal GPS position but the accuracy is lower and the GPS
device does not give you elevation data; only 2D reception is possible.
Several factors have an impact on the deviation between your real position and the one given by the GPS
device. For example, signal delay in the ionosphere or reflecting objects near the GPS device have a
different and varying impact on how accurately the GPS device can calculate your position.
5.1.2 Road safety cameras and other proximity Alert Points
There is a special proximity warning for road safety cameras (like speed or red light cameras) and other
proximity Alert Points (like schools or railroad crossings). These Alert Points are preloaded in Alpine
navigation.
The application can warn you when you approach road safety cameras like speed cameras or dangerous
areas like school zones or railroad crossings. You can set up the different alert types individually in the
Warnings settings, see page 74.
The following warning types are available:
•
Audio warning: beeps are played while you are approaching one of these points, or extra alert
sounds if you exceed the given speed limit while approaching.
•
Visual warning: the type of the Alert Point, its distance and the related speed limit appear on the
Navigation view while you are approaching one of these locations.
For some of the Alert Points, either the enforced or expected speed limit is available. For these points, the
audio alert can be different if you are below or above the given speed limit.
•
Only when speeding: The audio alert is only played when you exceed the given speed limit.
•
When approaching: The audio alert is always played when approaching one of these Alert Points.
In order to draw your attention, the alert is different when you exceed the speed limit.
Note!
The warning for road safety cameras is usually disabled when you are in a country where road
safety camera warnings are prohibited. Make sure that using this feature is legal in the country
where you intend to operate. Use it on your own responsibility.