Six weeks ago I embarked on what should have been a fairly mundane task of getting NMEA data from a GPS and some older Simrad gear imported into a laptop running Nobletec's Odyssey Time Zero navigation software. This wasn't my first time at the NMEA data rodeo, and the results were pretty typical. Using the existing Prolific serial to USB converter I could only have one talker, and one listener, not that I didn't try to get a second talker to work. Alas, but not unsurprisingly one talker only for you, and some of the older NMEA version data was getting lost in translation. To help with these issues a Actisense NDC-4 was purchased.