14.8 Is there a formula for calculating the direction and distance to a waypoint?

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VARIABLES AVGCOS 'Integral average of two cosine values DX 'W-E distance between starting and ending points in NM DY 'S-N distance between starting and ending points in NM CRS 'Straight-line course from starting to ending point DIST 'Straight-line distance between starting and ending points 

'PROCEDURE
If (LAT1 = LAT2) Then
  AVGCOS = Cos(LAT1)
ElseIf (LAT1 <> LAT2) Then
  AVGCOS = (Sin(LAT2) - Sin(LAT1)) / (LAT2 - LAT1)
End If
 
DX = 60 * AVGCOS * (LON2 - LON1)
DY = 60 * (LAT2 - LAT1)

If (DX = 0 And LAT1 > LAT2) Then
  TCRS = 180
ElseIf (DX = 0 And LAT1 <= LAT2) Then
  TCRS = 0
ElseIf (DX <> 0 And LON1 > LON2) Then
  TCRS = 270 - Atn(DY / DX)
ElseIf (DX <> 0 And LON1 <= LON2) Then
  TCRS = 90 - Atn(DY / DX)
End If
 
DIST = Sqr(DX * DX + DY * DY)

MDK

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