Abstract: When the scan interval or time between successive potential detections is long with respect to a potential target's maneuvering capability (say on the order of ten seconds for a radar system), there is the possibility that the target may be able to deviate far enough away from its last detected position at scan i-1 that correlation of the target with a detection in scan i may not be possible using conventional tracking methods. The present invention uses a maneuvering gate to monitor a volume in space. The volume is bounded by intersecting ellipsoids and is disposed, preferably uniformly about the target's last estimate velocity vector. The surfaces of the ellipsoids which bound the volume may be determined by determining the loci of a combination of a straight and turning maneuver at a predetermined acceleration, which acceleration may be selected to be the maximum acceleration expected to be achievable by a predetermined target. When target correlation is disturbed or lost, the volume is examined.