Great circle and rhumb line

Distances, true courses and intermediate passage coordinates.

Calculation of true courses, distances, and intermediate coordinates between departure and arrival positions for sea and ocean passages.

Into the ocean

Orthodrome and loxodrome

Calculation of true courses, distances, and intermediate coordinates between departure and arrival positions for sea and ocean passages.

Coordinate format

From

Lat deg Lat min (tenths) N/S Lon deg Lon min (tenths) E/W

Route list step, nm

Enter coordinates for two positions.

Orthodrome

Distance: —

Initial true course: —

Final true course: —

Loxodrome

Distance: —

Constant true course: —

Route points

Point	Latitude	Longitude	True course	From start, nm
Route points have not been calculated yet.