Figure F1. Artist's renderings of deepwater Dynamics of Earth and Ocean Systems (DEOS) observatory buoys resulting from (A) 2001 United States (US) National Science Foundation (NSF)-supported DEOS design study and (B) 2001 United Kingdom (UK) Natural Environment Research Council (NERC)-supported DEOS design study. Both buoys and mooring systems are designed to provide stable, multiyear to decadal-scale support for long-term observatory measurements at the air/sea interface, within the water column, on the seafloor, and below. They are designed to maintain better than 95% quality of service of continuous medium bandwidth bidirectional satellite telemetry to shore stations and, through them, the Internet. They also generate 1.5–2.0 kw of continuous electrical power at the sea surface using (A) multiple diesel and (B) diesel or fuel-cell technologies. The US design is a spar buoy with three-point mooring optimized for deepwater deployment in tropical through temperate climates. The UK design is a hybrid design with two-point mooring optimized for deepwater deployment in particularly harsh extreme northern and southern latitudes.