PTTI is the annual conference sponsored by ION, and co-located with the Institute of Navigation's International Technical Meeting with a technical program designed to disseminate and coordinate PTTI information at the user level, review present and future PTTI requirements, inform government and industry engineers, technicians, and managers of precise time and frequency technology and its problems, and provide an opportunity for an active exchange of new technology associated with PTTI. A commercial exhibit and pre-conference tutorials is held in conjunction with the conference.