Installing awnings in areas where salt laden air is present requires extra care on the part of the owner. Salt air is extremely corrosive on all objects including "Non-Ferrous" metals like stainless steel and aluminum.
Please download the PDF linked below for instructions on caring for awnings and any other metal products that will be exposed to a salt air environment. Salt corrosion is not covered under any manufacturer's warranty. You will be much happier with your awning investment later by taking precautions now!