Mariners - Ouestion for Borge Solem

Question for Borge Solem I am traveling from Canada in May, 2007 to Oslo and to Tune, Norway where my grandfather Wilhelm Hansen was born in 1902. His father Olaf Hansen was listed as a Sailor, First Mate in the 1900 Tune census (he was listed as away in Liverpool). Where do you suggest that I could to look for his merchant marine records? Archives in Oslo, Skiebeg or Sarpsborg? Or the Marine Museum in Oslo? He died in 1907. Your article suggested I give advance notice to the research institutions Thanks for any help you can give me! Denise Hansen