Hi,

We have a Garmin GPSMap 210 - interfaced with a Robertson autopilot.

I want to add electronic charting and need to get the nmea signal into
my laptop.

I've identified the nmea in and nmea out wires, but what do I need to
do to interface with the computer?

I imagine it's some sort of magic box that converts to a serial or usb
plug?

Or can I hardwire the input and output into the serial plug?

Hard to find any real sailors around here to ask this time of year.
Too cold and the Bahamas are too close.

Thanks for the help,

Mike.