Explains how the Global Positioning System works, its development and use.. (Copyright 2006 by Librarians' Internet Index)
Tells how British clockmaker John Harrison solved the problem of calculating longitude and thus 'discovered the key to navigating on the open seas.' Also explains the Global Positioning System (GPS). Has a teacher's guide.. (Copyright 2006 by Librarians' Internet Index)
'Australia's national agency for geoscience research and geospatial information.' Online tools include a place name database, mapping systems, earthquake maps, astronomical information (Sunrise/Sunset times, Moonrise/Moonset times), and distance calculator. (Copyright 2006 by Librarians' Internet Index)
