OK here goes:
Amphibians in Shallow Ocean hexes ver 1.1
A Shallow Ocean hex is at -1 Level, is not a Land hex and is not a Water Obstacle to an amphibian because an amphibian is not a boat or LC [G13.4 EXC]. In a Shallow Ocean hex, an amphibian is a Waterproofed vehicle [G13.42], uses Land MPs...