In RW lattitude was traditionally determined from the stars. Given the
odd behaviour of Gloranthan stars, much might be possible without
resorting to compasses. I recall there being a discussion on the stars
last year, can anyone recall if we have a pole star? Do we have other
stars in fixed positions? All it would take is three fixed stars and
you're home and hosed, though presumably this would require the stars
being close enough that your bearings on them altered noticably as you moved
about the lozenge.
Owen Jones
Centre for Maths and its Applications, School of Math. Sciences
Australian National University, ACT 0200
Ph +61 6 249 2897 (office) 249 4552 (direct) Fax +61 6 249 4675
Web page http://wwwmaths.anu.edu.au/~oj/