The objective of this work is to design, fabricate, and test 5 specific technological advances to profiling floats. These advancements include (1) adding Iridium communications to floats, (2) adding an acoustic rain gauge to floats; (3) adding a dissolved oxygen sensor; (4) producing a float that can operate to a depth of 2000 m anywhere in the world ocean; and (5) examining in detail methods for allowing floats to work ...