devices 20 require electrical power when power through streamer 14 cable 26 is not available for example electrical power is needed for navigation and positioning devices that give headings or distance measures acoustic ranging when vessel power is not available the present invention provides in sea generator 24 to harvest mechanical energy from the water movement referred to as sea wave movement and convert it to electricity to one or more of devices 20 para vane 16 is often deployed on streamer 14 to positioned and maintain streamer 14 is a desired position relative to vessel 20 and other streamers 14 para vane 16 may include electrical powered navigation and or positioning equipment 20 a often devices 20 a are not powered by vessel 20 or they require electrical power when streamer power is not available an in sea generator 24 of the present invention may be deployed in para vane 16 to provide the auxiliary power required for device 20 a or other devices 20 positioned along streamer 14 another example of positioning of in sea generator 24 is in tail buoy 18 tail buoy 18 is commonly provided as a part of a streamer 14 to serve various purposes of relevance to the present invention tail buoy 18 often carries.