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Mariner's Formulae Quick reference guide
Course, Distance & Arrival Position
 

  1. δLat = difference in Latitude between the 2 points, N or S
  2. δLong = difference in Longitude between the 2 points, E or W
  3. θm = mid-Latitude
  4. θc = Course
  5. D = Distance
  6. p = Departure


COURSE

tan θc   =   cos θm x δLong
                       δLat


DISTANCE

Distance   =        1    
                      cos θc


ARRIVAL POSITION

Difference of Latitude   =   D x cos θc

Difference of Longitude   =   D x sin θc
                                            cos θm

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