On July 26 2001, UPS Aviation announced that a software/hardware upgrade would be available to enable the UPS/IIMorrow line of GPS receivers (GX series and SL series) to be compatible with the ST-901 GPSS converter and System 55X Autopilot. The software upgrade will cost $395 to non database subscribers and $295 to database subscribers. A $995 &black box& will be required for this conversion of RS-232 signal output from the UPS units to the ARINC 429 standard required for the GPSS unit. For more information on this upgrade, please click Here.