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products   companies   categories External communication systems Radio communication (5) Antennae (0) Underwater telephone (0) Visual signalling equipment (3) Sound signalling equipment (3) Satellite communication (7) products   companies   categories Radio communication McMurdo Click name for more product information.     Raytheon Systems Ltd Click name for more product information.     RS Aqua Limited Radio/Xenon Location Beacons   Sub-surface mooring monitor. Alarm status activates on surfacing. Mooring life up to 2 years, transmission life up to 3 months. Versions rated for surface to full ocean depth     QED Audio Products Company information available.     Simrad Ltd Company information available.