© David Last 14 January 2009 Royal Ulster Yacht Club Satellite Navigation – Truths & Myths? Professor David Last Picture: earthobservatory.nasa. gov//ewsroom/BlueMarble
© David Last Loodswezen Congress of Dutch Pilots 1 September 2008 Satellite Navigation Systems – The Present Imperfect Professor David Last Picture: earthobservatory.nasa.
© David Last 38th ILA Convention and Technical Symposium October 13-15, 2009 Portland, Maine USA Crime, GNSS Jamming & Enhanced Loran Professor David Last.
