initial great-circle course
initial great-circle course[i′nish·əl ′grāt ‚sər·kəl ‚kȯrs]
The direction, at the point of departure, of the great circle through that point and the destination, expressed as the angular distance from a reference direction, usually north, to that part of the great circle extending toward the destination. Also known as initial great-circle direction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.