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Compass error forces ATTI mode, even though I had 12-16 satellites
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<blockquote data-quote="The Editor" data-source="post: 15704" data-attributes="member: 82"><p>The number of satellites locked or received is pretty meaningless and people get hung up on the idea of "well I had 47 satellites on my display so it shouldn't have lost GPS"</p><p>This is wrong, the important thing is Horizontal and Vertical dilution of precision or HDOP/VDOP for short and this is shown as the small bar graph display next to the satellite numbers.</p><p>Since you will only really see maximum of 12 satellites above the horizon in any one constellation at any time seeing 7 or 8 sats could mean 3 from NAVSTAR (GPS) and 4 from Glonass constellations so your positional accuracy can not only be hindered by dilution of precision but also triangulation accuracy of the numbers of sats received from one constellation.</p></blockquote><p></p>
[QUOTE="The Editor, post: 15704, member: 82"] The number of satellites locked or received is pretty meaningless and people get hung up on the idea of "well I had 47 satellites on my display so it shouldn't have lost GPS" This is wrong, the important thing is Horizontal and Vertical dilution of precision or HDOP/VDOP for short and this is shown as the small bar graph display next to the satellite numbers. Since you will only really see maximum of 12 satellites above the horizon in any one constellation at any time seeing 7 or 8 sats could mean 3 from NAVSTAR (GPS) and 4 from Glonass constellations so your positional accuracy can not only be hindered by dilution of precision but also triangulation accuracy of the numbers of sats received from one constellation. [/QUOTE]
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Compass error forces ATTI mode, even though I had 12-16 satellites