Here are some good references for learning navigation without GPS, or even map and compass. It is also fun to practice.
Emergency Navigation, 2nd Edition (Paperback)
by David Burch (Author)
International Marine/Ragged Mountain Press; 2 edition (June 20, 2008)
# ISBN-10: 0071481842
# ISBN-13: 978-0071481847
Emergency Navigation Card (Cards)
by David Burch (Author)
Paradise Cay Publications (June 2000)
# ISBN-10: 0939837587
# ISBN-13: 978-0939837588
The Lo-Tech Navigator (Paperback)
by Tony Crowley (Author)
Sheridan House (July 31, 2004)
# ISBN-10: 1574091913
# ISBN-13: 978-1574091915
Finding Your Way Without Map or Compass (Paperback)
by Harold Gatty (Author)
Dover Publications (March 19, 1999)
# ISBN-10: 048640613X
# ISBN-13: 978-0486406138