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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Reality check
From: Guy Schwartz
Date: 2006 Jun 5, 23:11 -0700
From: Guy Schwartz
Date: 2006 Jun 5, 23:11 -0700
When using HO 249 The assumed latitude is rounded and the assumed Longitude
is the number that will make the LHA an even number (within the range of +/- 30
min. of the DR Longitude). When plotting the assumed Lat and Long are used as
the starting point of the procedure. OK if I use the formulas:
Sin-1Hc = sin(dec) x sin(lat) + cos(dec) x cos(lat) x cos(LHA) and Cos-1
(Zn)= sin(dec) - sin(lat) x sin(Hc) / cos(Hc) x cos(lat) to calculate Hc and Z
or Zn and then plot my position
wouldn't I be using the DR position as the start point?
Thank you,
Guy
