Dr. Gregory Gutt of Satelles presented “Recent PNT Improvements and Test Results based on Low Earth Orbit Satellites” on Wednesday, January 31, 2018 at the ION International Technical Meeting / Precise Time and Time Interval Systems and Applications held (ITM/PTTI) held January 29–February 1, 2018 in Reston, Virginia.The Precise Time and Time Interval Systems and Applications (PTTI) meeting is an annual conference sponsored by ION 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. This year, PTTI was co-located with the ION International Technical Meeting, in Reston, Virginia. Commercial exhibits and pre-conference tutorials were held in conjunction with the conference.   Link to full program