Abstract: A remote speaker microphone having a directional microphone, a speaker, and a housing. The housing has a first portion sized to contain the speaker and a second portion sized to contain the directional microphone. The second portion defines a front port positioned adjacent the front surface of the directional microphone and a rear port positioned adjacent the rear surface of the directional microphone. The housing is configured to minimize the distance that sound waves travel within the housing before impacting on the sound receiving surfaces of the microphone.

Abstract: An aquatic vegetation harvesting system for clearing aquatic vegetation from bodies of water is disclosed. The system comprises a harvesting device, a receiver on the vessel for receiving position data from a global positioning system satellite, a storage device for storing digital map data representing a predetermined vegetation harvesting plan for the body of water, and a processor for receiving position data and digital map data wherein the processor continuously outputs harvesting signals derived from comparing position data and digital map data to the dispensing system to the harvesting device or to a user display such that the harvesting device may be activated to harvest the vegetation.