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    Re: Flight Levels CelNav; 02/10/2018
    From: Gary LaPook
    Date: 2018 Mar 1, 01:10 -0800

    From: Tracy Shrier
    Date: 2018 Feb 18, 21:24 -0800

    Sight reduction was done from the visual average of 2 minute sights. Altitudes of Mirfak and Aldebaran above 40° create greater refraction through the CRJ windows, as I'm working through my history I'm seeing the need for 15 or 20° more correction than the Std Dome, but I did not make any extra here.  The cocked hat came out a bit wider with the refraction errors, but the CelNav fix is still only15-16 nm from our FMS location.  I later ran a standard reduction on the sights and plotted lop's advanced/retired to 0500. The results:       FMS - N41°14'  W97°28'                                                                                                                                                                                                                        CPU- 41/P - N41°10'  W97°10'                                                                                                                                                                                                                              Plotted - N41°10'  W97°08'

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    It was interesting going over your computations and I have attached my reproductions of them. I notice that you didn't apply the "precession and nutation" correction which requires moving the fix 3 NM in direction 100 ° true. I plotted the fix on the Polhemus and got fix coordinates of 41° 05' N, 97° 10' W. When I plotted on a plotting sheet I got 41° 07' N, 97° 05' W. On both plots I moved the AP 3 NM, 100° to allow for the P&N correction. Using the Polhemus MOO and MOB scales I ended up with two of my intercepts being 1 NM different from yours due to rounding. 

    gl

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