Several technologies developed for the Transit Navigation System were
later transferred to implantable medical devices. These devices includ
e pacemakers, the Automatic Cardiac Implantable Defibrillator, and the
Programmable Implantable Medication System for the treatment of diabe
tes. AII of these applications employ Transit-derived telemetry and co
mmand systems for programming and data retrieval. These implantable de
vices have been used successfully in patients throughout the world for
several decades.