Abstract: Circuits and techniques are described that relate to an “energy operating system” for tracking available energy and energy consumption in a system or device to support a wide range of power management and related functionalities.

Abstract: An apparatus for viewing underwater environment includes a generally hollow housing having a first end engageable with a water surface, an opposed second end and a sloping conical portion connecting the first end and the second end, elevating the second end to a predetermined distance from the water surface, when the first end is engaged therewith and providing unobstructed viewing of the underwater environment from the second end. A transparent pane member is mounted in a watertight manner with the first end of the housing and is engageable with the water surface for enabling viewing of the underwater environment. A face guard is attached to the second end for preventing light from entering an interior portion of the housing and causing a glare on the pane member. A counterbalance member is integrally disposed within the housing adjacent the first end for maintaining the transparent pane member in engagement with the water surface and preventing forming of air pockets.