R4 Automatic Identification System (AIS)
The Sperry Marine R4 Automatic Identification System (AIS) consists of a radio transceiver unit, a GPS receiver, a controller unit and a separate display unit. The R4 AIS will enhance safety at sea and provide better mand-based services for mariners. The R4 Class A Transponder system is type-approved and complies with international standards for AIS.