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Talex
Talex can also work out its speed and direction of travel, its height above sea level, as well as the time and the date. The Talex unit can store around 150,000 positions in its database. These can be divided into different data sets, to distinguish between such positions as fixed speed cameras, possible mobile camera positions, red light cameras, schools, and accident black?spots. These are also sub divided by speed limit, and allocated a voice alert. Thus the driver is alerted to a fixed or possible mobile camera site, and given the speed limit at that site. The Talex unit also has an LED display on the front of the unit, which provides additional information to the voice announcements. Whilst driving normally it will display the current speed. When a warning is triggered, a chime is heard followed by an announcement such as ?Warning speed camera 500 yards ahead ? limit 30 miles per hour', the speed limit at the camera site will flash for eight seconds, before going back to displaying the vehicle's speed. |
Talex
operates via a system of satellites in orbit around the Earth. The signals
from the GPS satellite can be used to pinpoint a position anywhere on the
Earth's surface to a very high accuracy (+/?5m).