Part of its Natural Resources Program, NASA has sponsored for the past two years a government-wide effort to identify user requirements and to determine through a series of experiments the feasibility of employing earth- orbiting spacecraft to conduct peaceful and scientific studies and surveys of the world ocean. Ground truth test sites have been selected in the general area of Bermuda, Straits of Florida, the Gulf Stream, San Diego, and Pt. Barrow. Remote-sensor equipped aircraft are being used in various experiments over various ocean areas to gain an early appreciation of the problems and capabilities of spacecraft oceanography. Remote sensors tested to date include multi-band color cameras, radar scatterometers, infrared spectrometers and scanners, passive microwave radiometers, and radar imagers.