Seems very clear :)
A funny thing to translate :)
Part 1 (file linked)
Tell me if that works on your Navigator :)

Here the beginning of the rest Part 2(Commande ''Courbe") & follow (in english command "Curve")
version 27 septembre 2007(not yet totally finished)
French moi command2.zip
http://moi3d.com/forum/get_attachment.php?webtag=MOI_FRANCAIS&hash=b526e866ca9b8143100c68bcc605641f