Next message: Greg R.: "Re: Removing/Replacing Sextant Mirrors?"
Of course if you use the formulas, you can use any start point, one of which being your actual DR position. This start point induces non rounded values for LHA and Lat.
JPP
Guy Schwartz <> wrote:
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
JPP
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