The deadline for submitting abstracts for the ION co-located International Technical Meeting (ITM) and the Precise Time and Time Interval (PTTI) Systems and Applications Meeting is Tuesday 10 October, 2017. Abstracts may be submitted online for the ION ITM/PTTI 2018 conference that will take place 29 January – 1 February, 2018 at the Hyatt Regency Reston, Reston, Virginia.