A bill to amend the Merchant Marine Act to extend the Great Lakes Set Aside for the duration of the increase in the cargo preference.

Amends the Merchant Marine Act, 1936 to extend indefinitely, with regard to certain cargo preference provisions, the requirement that the Secretary of Transportation take steps to preserve the percentage share, or metric tonnage of bagged, processed, or fortified commodities experienced in calendar year 1984, of waterborne cargoes exported from Great Lakes ports pursuant to specified provisions of the Agricultural Trade Development and Assistance Act of 1954.