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<blockquote data-quote="pretzel_man" data-source="post: 657257" data-attributes="member: 927"><p>Hello,</p><p> </p><p>First, the system doesn't determine the address based on the GPS reading.</p><p> </p><p>Second, the GPS is more accurate than 75ft.</p><p> </p><p>Here is information from the manufacturers website (I put XX's through the company name in case its not public):</p><p> </p><p>The GPS module used in the xxxxxx unit report an accuracy of 2.5 m CEP, making trip distance very accurate.</p><p></p><p>xxxxxx xx units use an on-board UBLOX GPS module to read GPS data second by second. The zz unit will only log GPS data if it meets the following criteria. </p><p>• 3-D Fix acquired (minimum of 4 satellites) </p><p>• Speed must be accurate to 1 m/s or better (Speed Accuracy measurement provided by Ublox with each GPS reading) </p><p>• PDOP and TDOP better than 10 </p><p></p><p>Positional Dilution OF Precision (PDOP) is a measure of uncertainty in a GPS position solution. The best PDOP (lowest value) would occur with one satellite directly overhead and three others evenly spaced about the horizon. </p><p>Time Dilution Of Precision (TDOP) is a measure of how the satellite geometry is affecting the ability of the GPS receiver to determine time. </p><p></p><p> </p><p>Our experience has been that its very accurate. Maybe not quite as accurate as the manufacturer says, but much, much better than 75 feet.</p><p> </p><p>P-Man</p></blockquote><p></p>
[QUOTE="pretzel_man, post: 657257, member: 927"] Hello, First, the system doesn't determine the address based on the GPS reading. Second, the GPS is more accurate than 75ft. Here is information from the manufacturers website (I put XX's through the company name in case its not public): The GPS module used in the xxxxxx unit report an accuracy of 2.5 m CEP, making trip distance very accurate. xxxxxx xx units use an on-board UBLOX GPS module to read GPS data second by second. The zz unit will only log GPS data if it meets the following criteria. • 3-D Fix acquired (minimum of 4 satellites) • Speed must be accurate to 1 m/s or better (Speed Accuracy measurement provided by Ublox with each GPS reading) • PDOP and TDOP better than 10 Positional Dilution OF Precision (PDOP) is a measure of uncertainty in a GPS position solution. The best PDOP (lowest value) would occur with one satellite directly overhead and three others evenly spaced about the horizon. Time Dilution Of Precision (TDOP) is a measure of how the satellite geometry is affecting the ability of the GPS receiver to determine time. Our experience has been that its very accurate. Maybe not quite as accurate as the manufacturer says, but much, much better than 75 feet. P-Man [/QUOTE]
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