The Kreigsmarine assess it has to assemble:
All the steamers, barges, lighters, tugs and even motorboats and fishing craft operating on Germany's inland waters as well as out of the seaports themselves. These would additionally need converting to transport troops.
30,000 mines, depth charges, and other material for sealing off the amphibious area.
Mount several heavy coastal batteries at Cape Griz-Nez and other points on the French coast opposite Dover.