Owner’s Manual

4 Reference guide

The following sections describe the different concepts and menu screens of iGO Navigation

app.

4.1 Concepts

The following sections describe and explain navigation-related concepts.

4.1.1 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.

4.1.2 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 not

part of iGO Navigation app.

You can add your own Alert Points. See page 72.

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 89.

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.