For reference155 Forreference3. GlossaryIn order to use this device effectively, please keep the following definitions in mind.GPS (Global Positioning System)The GPS is a system that uses signals receivedfrom a satellite in a maximum orbit ofapproximately 21,000 km above the earth toindicate your present position (latitude,longitude, altitude).These satellites were launched into space by theU.S. Department of Defense to be used formilitary purposes. This system was released forpublic utility.Independent navigationThis technology uses data from a vehicle speed sensor and vibration gyro sensor to track thepath followed by your vehicle in order to pinpoint your present location.The present location of your vehicle can be pinpointed even in tunnels and under elevatedroads.PositioningSignals are received from 3 or more GPSsatellites to pinpoint the present location of yourvehicle. The device will display a markon the upper left part of the present locationscreen when it is receiving signals from 3 or moresatellites and positioning is rendered possible.(The mark is not displayed on thesetting or registration screens.)
