In March the European Union released its Radionavigation Plan calling for non-space backup systems for GNSS.
Late last month the European Commission announced an effort to identify user requirements for such backup systems. In a memo dated the 26th of April Galileo Programme Manger Paul Flament said:
“One of the main findings of the ERNP (European RadioNavigation Plan) shows that GNSS cannot be the sole means of PNT information in some specific cases e.g. for critical applications requiring both continuous availability and fail-safe operations.”
The memo projected a meeting/workshop event on user requirements by the end of June 2018. Copy of memo here.