IAIN held its 15th World Congress in Prague from 21-24 October 2015. The fourth Forum on Resilient Positioning, Navigation and Timing (PNT) was held on 20 October 2015, immediately preceding the Congress.

Motivation has been the increasing reliance on Global Navigation Satellite Systems in all transport sectors, for timing and other essential infrastructure throughout the world. The inherent vulnerability of GNSS to disruption makes it essential to provide resilient supporting systems, particularly for safety of life and economically critical applications. Robust systems in the presence of interference, with integrity monitoring and authentication, can only be achieved through cooperative efforts by industry, administrations and user groups.