Starpath DR Calculator
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Position Input Format
ddd.ddd
dd mm.mmm
Initial Latitude
Initial Longitude
Initial Latitude
°
'
N
S
Initial Longitude
°
'
E
W
Course (True)
Distance Run (nmi)
Great Circle Earth Radius
Spherical earth, 1' = 1 nmi (R = 6366.707 km)
Average WGS84 (R = 6371.0 km)
Compute
Navigation Results
Great Circle Solution
Position (dd mm.mmm)
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Position (ddd.ddddd)
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Course
--
Distance
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Rhumb Line (Mercator) Solution
Position (dd mm.mmm)
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Position (ddd.ddddd)
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Course
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Distance
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Note:
Great Circle uses spherical approximation with selected radius. Rhumb Line uses Bowditch Mercator sailing with meridional parts (Table 6 formula). 1' latitude = 1 nmi exactly.