NMEA with Chips!
Activating a USB port to enable NMEA data inputs within an older (pre-USB plug-and-play era) was proving a source of frustration. Activating the port via a direct USB feed taken from a protected circuit driven my an Actisense Multiplexer was the intended solution but Open CPN was unable to recognise the USB port on a laptop. Although there are a number of costly solutions on the market but after fitting (the brilliant) multiplexer adding another unit in the chain seemed folly. Enter the FDIC chip which fools a USB port into recognising RS232 inputs, which are direct NMEA feeds taken