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<blockquote data-quote="breadbooze" data-source="post: 157759" data-attributes="member: 4476"><p>How accurate the GPS is depends on how many satellites it's locked onto, your location, and whether it uses "differential" correction. The gov't still has "selective availability" in place at sensitive areas such that GPS error is 50-200 yards. Modern GPS receivers with correction are accurate to within 3 feet, but it is doubtful UPS would pay for such technology. More likely than not the D4 is an 8 channel receiver that locks onto 3 satellites (minimum needed for 2D navigation, since we don't need to know how high we are), and thus prone to higher error. 245 yards would be within the error range for GPS, good enough for deliveries in most parts of the US.</p><p></p><p>Personally I find it transparent, it doesn't affect how I do my job unless I'm sheeting a nondelivery at a different location.</p></blockquote><p></p>
[QUOTE="breadbooze, post: 157759, member: 4476"] How accurate the GPS is depends on how many satellites it's locked onto, your location, and whether it uses "differential" correction. The gov't still has "selective availability" in place at sensitive areas such that GPS error is 50-200 yards. Modern GPS receivers with correction are accurate to within 3 feet, but it is doubtful UPS would pay for such technology. More likely than not the D4 is an 8 channel receiver that locks onto 3 satellites (minimum needed for 2D navigation, since we don't need to know how high we are), and thus prone to higher error. 245 yards would be within the error range for GPS, good enough for deliveries in most parts of the US. Personally I find it transparent, it doesn't affect how I do my job unless I'm sheeting a nondelivery at a different location. [/QUOTE]
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