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Remote sensing techniques in the ocean often rely on buoy platforms which utilize various instrumentation and communication equipment to measure and transmit real-time oceanographic and meteorological data. The operating lifetime, payload capacity, and sampling rate of such platforms are limited by onboard battery power, since typical systems can draw between tens to a few hundred Watts of continuous power during operation. Here, we describe a wave energy harvesting device (WEHD) which utilizes the heaving motion of a surface buoy to generate power over a broad range of sea-states and wave periods. This energy capture method is more energy dense than and complementary to solar harvesting. The heave-body design and results from laboratory tests and at-sea demonstration are presented.