A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Gary LaPook
Date: 2015 May 28, 22:17 -0700
I received my CP-300 today. It is very similar to the HO 2102-D. Some differences, the scale is sligtly smaller for the grids and the altitude curves go down to negative 10 degrees instead of zero. This might be useful for high flying B-52s where it is possible to shoot a negative Hs.
I reviewed Mp. Popko's article and was confused at first. Then I reallized that the his figure 2 does not illustrate the example he gives. Then I noticed that the figure 2 is mislabled. It is set to GHA Aries of 347 and the assumed longitude is set to 106 east not the 74 west in the label. This is obvious since the LHA is 93 and it would be 273 at longitude 74 west.