Re: Air safety is an International issue
I don't know where you are getting this idea that GPS is our main tool for navigation. It isn't; it's a secondary source at best. GPS is jammed in many countries and by many governments (including the UK armed forces in various parts of the UK). Satellites go unserviceable all the time, leading to unreliable 3d fixes (not such a problem if you just need a 2d fix for car navigation). Not having GPS available as a data source is something that happens routinely. It is not adding anything to our task list - not least because when GPS is available we don't trust it.
GPS is not used in landing systems, it has no bearing on ILS approach procedures.