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Using Sean’s numbers I get the following:

Initial GC course from spreadsheet sailings.xls:
30.284° (add 180°): 210.284°

GC distance from spreadsheet:
4878 nm (subtract from 21600 nm): 16722 nm

GC north vertex (from spreadsheet):
N 62° 49.4’
E 138° 23.7’

GC south vertex (reverse latitude, subtract 180° from longitude):
S 62° 49.4’
W 41° 36.3’

Waypoints in increments of 15° of longitude (see chart, I just eyeballed the latitudes there) are computed in spreadsheet waypoints.xls.

Here the total length is computed to be 17131 nm, but that result works with rhumb-line segments between the GC waypoints, which is why it comes out a little larger than the GC value of 16722 nm.


Peter Hakel

PS. Some of my numbers could/should be rounded to a smaller number of significant digits, but I decided to show them essentially as computed.

Depart: Gwadar, Pakistan 25°05'N, 62°18'E; heading ~207°.
Pass between Madagascar and Mozambique.
Pass between Nordenskjold Coast, Antarctica and the Hermite Islands, Chile.
Arrive: Olyutorskiy zaliv, Russia 59°50'N 166°21'E.

Total Distance: ca. 17,000 nm

-Sean C.