reference craft

reference craft

[′ref·rəns ‚kraft]
(navigation)
A craft to which relative movement of other craft is referred; on a maneuvering board this first craft is placed at the center; it may be a reference ship, reference aircraft, or reference vehicle, depending upon the type of circumstances.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.