91-01/Polh.again Polhemus, Inc. P.O. Box 560 1 Hercules Drive Colchester, VT 05546 (or is this 05446?) 802-655-3159 802-655-1439 (FAX) 3SPACE Isotrak(R) $ 3,145 Tracks a single sensor, can be used as a 3D mouse. 3SPACE Tracker $11,000 Tracks multiple sensors, good for Eyephone, DataGlove, etc. 3SPACE Digitizer $13,900 Tracks sensor mounted in a stylus for digitizing objects. And for you hackers who want to figure out how it works, look up the following patents: Number: 3,983,474 Title: Tracking and Determining Orientation of Object using Coordinate Transformation Means, System and Process Inventor: Jack Kulpers Assignee: Polhemus Navigation Sciences, Inc. Date: Sept. 28, 1976 Number: 4,017,858 Title: Apparatus for Generating a Nutating Electromagnetic Field Inventor: Jack Kulpers Assignee: Polhemus Navigation Sciences, Inc. Date: Apr. 12, 1977