TRUE HEADING AIS-CTRX Class B AIS Transponder AIS CTRX Sender & ReceiverTRUE HEADING AIS CTRX Class B AIS Transponder For spare parts or repair only. Note: Unit power up. You will receive what you can see in the photos. **** The AIS CTRX is a high quality AIS Class B Transponder using the latest technology. AIS CTRX makes it possible to receive information from ships, buoys, lighthouses, SAR helicopters, Coastguard units, Pilot boats, Weather station etc. and to send information about your own ship to others that are