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NOTICE EN ANGLAIS DescriptionThis USB GPS Receiver for Computers is a compact, accurate GPS receiver with low powerconsumption that works directly from your computer's USB port and does not require user initialization or external power. All you need to do is plug it into the USB port of your laptopor netbook and install the GPS navigation software of your choice and you're good to go! This USB GPS receiver performs even better than car-dedicated GPS units or handhelds as the magnetic base of the antenna allows it to be securely positioned wherever you find thebest view of the sky (and hence best reception) or even placed on the outside of the vehicle.This USB GPS receiver incorporates the latest SiRF Star III GPS chipset and a built-in patchantenna so you receive a high degree of GPS accuracy and performance even at low signal levels.Data output by this GPS receiver include latitude, longitude, altitude, velocity, satellite and receiverstatus and to ensure up-to-the-second accuracy, the receiver tracks up to 20 satellites at a time,re-acquires satellite signals in about 100 milliseconds and updates position data every second. Specifications* Primary Function: USB GPS receiver* GPS Chipset: SiRF Star III* Satellite Tracking: Tracks up to 20 satellites* Receiver: L1, C/A code* Max update rate: 1 HZ* Acquisition time:     -Reacquisition: 0.1 sec average     -Hot start: 1 sec     -Warm start: 38 sec     -Cold start: 42 sec* Position Accuracy     -Non DGPS (Differential GPS):     -Position: 5-25 meter CEP without SA     -Velocity: 0.1 meters/second, without SA     -Time: 1 microsecond synchronized GPS time* EGNOS/WAAS:* Position:      < 2.2m, horizontal: 95% of the time      < 5m, vertical: 95% of the time* Dynamic Conditions:       -Altitude: 18,000 meters (60,000 feet)...