Upgrade Your Compu-Course 220 To Accept NMEA 0183
Upgrade your Compu-Course 220 software to accept NMEA 0183, version 1.5, APA, APB, or XTE from a GPS receiver.  Cost to upgrade is $225.00 (plus shipping costs) and takes 2 - 3 days.  Send the APU unit only and mark the outside of the box "CC220 upgrade".