Should horizontal correction be multiplied with the cosine of your heading in relation to a N-S line? Where is horizontal component when shooting due east and west? Horizontal correction will NOT be multiplied by the cosine of your heading. At the distances we are shooting, horizontal Coriolis effect is only a function of latitude and time of flight. Out to 2000m, azimuth differences will have no effect on our horizontal correction. It is true that beyond 2000m, you will start to see a small effect on horizontal deflection's magnitude due to azimuth although its direction stays the same. If you look at a TFT for a 105mm gun, the horizontal correction @ 5000m for due North is 0.4 mils L while shooting due East it is still only 0.5 mils L (a very small difference). The reason for this is that a projectile will never travel in a straight line between two points on the surface of a sphere with an unchanging azimuth. If the Earth was a cylinder, this would be much more simple. If you would like to confirm this from other sources to put you mind at rest, please look at the BRL Report No. 1371 The Production of Firing Tables for Cannon Artillery (Nov 1967) page 102. The Kestrel Horus device will also confirm that horizontal Coriolis (inside of 2000 - 2500 meters) is independent of DOF as well. Thank you for your donations to the Rex Reviews Project! We hope these videos continue to be a great help to you all. All the music in this video was created by TiborasaurusRex, an unsigned artist. Song Title: Wadi Watir, Dawn of the Day, Magnetic Night Music and Lyrics by: TiborasaurusRex Instrumentation and Vocals by: TiborasaurusRex Recorded by: TiborasaurusRex