GPS DME VS DME
Join Date: May 2009
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You are trying to compare apples with oranges - DME distance and GPS distance are different things. If the approach calls for you to use DME then that is what you should use. If the approach uses GPS then you should use GPS. You shouldn't substitute one for the other.
Is a DME reading not a slant height, therefore reading further away than a GPS range from the same spot over the ground?
CG
CG
Last edited by charliegolf; 13th Mar 2016 at 18:30.
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GPS approach. GNSS APR approaches require an accuracy of 0.1 NM and are often more accurate. Ours always seem to be accurate to 0.05nm .DME/DME still very accurate and all that's required for RNAV 1.
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I have three IRS's on board and an FMS that will take information from every available position source - DME/DME, VOR/DME etc and if I look at the sensor page the one it is actually using is the GPS. It seems that as long as the GPS is in agreement with the others the FMS is actually using the GPS position. So I suspect that the GPS is the most accurate. I use it for precision approaches so it bloody better be!