2018-11-16, 02:56 PM
Your old GPS does use RS422 communication. You need a RS422 to usb adapter. The doc says it works from 4.5 to 16.5 volts
But the Navman 1220a is old. A new GPS is better (less energy, faster, more accurate).
Martin
But the Navman 1220a is old. A new GPS is better (less energy, faster, more accurate).
Martin