Upgrades [Home] [Upgrades] [Service] [Autopilots] 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 $275.00 (plus shipping costs) and takes 2 - 3 days. Send the APU unit ...