(Zombie thread warning)
Realizing this is an old thread, nonetheless here is a very good
Voyageur reference comparison and here are the author's (Sandro Fouché) pages on Voyageur's:
General info,
1983 Voyageur SP and
1984 Voyageur SP
The OP's dark blue (Midnight Blue, per Schwinn) by default, would make his bike an 84 or 85 Voyageur SP.