Legacy Actisense NDC-4 NMEA 0183 Multiplexer (RS232/PC Port)Legacy Actisense NDC 4 NMEA 0183 Multiplexer (For RS 232 PC Port connection) This is the last batch of NDC 4 remaining. We had been told they were no longer available, but . . . here they are. They were procured from Actisense at a discount which is reflected in the price We are not sure when they will be gone , but if you want one or 10 or other, now is your last chance to purchase them. The inventory could run out at anytime and there will be no