Mariners Registration.

After a query posted in the Mariners Forum regarding a seaman arriving in Australia around 1856, I was referred to the following article: norwayheritage.com/aticles/templates/genealogy.asp?aticled=4&zoneid=2 I am now informed by a Norwegian researcher that the registration details mentioned in this article are not available for pre 1860 sailors. Can anyone confirm that searching for the details of a Norwegian seaman during the period 1850- 56 is not possible and that the details in the above article need to be revised.