What is the distance at which the course indicator will reach full deflection during an RNAV (GNSS) or RNP approach without an SBAS receiver?

During an RNAV (GNSS) or RNP approach without an SBAS (Satellite-Based Augmentation System) receiver, the distance at which the course indicator reaches full deflection is typically 0.3 nautical miles. This distance is significant because it represents the point at which the lateral guidance is considered to be reliable and the pilot can begin to utilize the approach guidance effectively.

At this distance, pilots can expect the course deviation indicator to show full deflection when they are outside the desired lateral path, indicating they need to correct their course. This specific range is critical for ensuring appropriate and timely adjustments during the approach phase, which enhances safety and accuracy as the aircraft approaches the runway.

The other distances mentioned, such as 0.1 NM, 0.5 NM, and 1.0 NM, do not correspond to the typical operational standards for RNAV and RNP approaches without SBAS. Each has its own implications in terms of precision and operational use; however, the standard distance for full deflection without SBAS is, indeed, established at 0.3 NM.