radial-parallel search

radial-parallel search

[′rād·ē·əl ′par·ə‚lel ‚sərch]
(navigation)
Search by ship or aircraft on a series of radial course lines to a given line, beyond which parallel course lines are followed.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.