The Model GDC59 Converter provides on-ground-only position initialization to a Litef LCR-100 (AHRS) using data supplied by an ARINC 429 capable GPS receiver. To accomplish this, the GDC59 supports two ARINC receiver ports and one ARINC 429 transmitter port. Position data is received from the GPS on labels 310 and 311, and status is received from the AHRS on label 270. If the AHRS status equals "no position initialization" and GPS position data is valid, the GDC59 converts the GPS data from labels 310 (Latitude) and 311 (Longitude) into labels 041 (Set Latitude) and 042 (Set Longitude), then sends a short burst of Set Latitude and Set Longitude to the AHRS. The AHRS uses the present position data to speed its alignment process.