Buy used SAAB R4 used AIS Transponder Set  SAAB R4 Class A Shipborne used marine AIS (Automatic Identification System) Transponder system complete set for sale.  Set includes multifunctional high resolution 6” graphic day and night display unit (Part No. 7000 108-050 / R4 Navigation Display Part No. 7000 108-035) with Class A Transponder…