BEagle states that...GPS- only is never used for navigation.
Cannot speak for the UK, but in the USA it IS perfectly legal to depart IFR with GPS only, fly enroute (below FL180), approach to and land at an airport using an approved GPS approach. The GPS installation in the aeroplane MUST be IFR approved AND be fitted with a current database.
In addition, in these days of proliferating TFR's and restricted airspace, a moving map display (which I also have incorporated in the GPS) allows a positive way to avoid these areas so that one does not get close and personal with an F-16.
