RHOTHETA International is building on 30 years of experience in the design, development and production of high-quality direction finders for ATC, VTS and SAR applications. In the area of SAR technology, the company specializes in equipment for professional SAR organizations active at sea and on land. What We Do? Advanced Direction Finding and Location Systems for Air, Land & Sea. RHOTHETA specializes in multi-platform Radio Direction Finding and Location sensors and software solutions.