What accuracy does GPS typically provide in enroute phases?

In the enroute phase of flight, GPS typically provides an accuracy of about 2 nautical miles. This standard is based on several factors, including the satellite geometry and the potential for signal errors that can occur during typical flight conditions.

While GPS can offer greater precision under ideal circumstances, such as in approach phases or when enhanced systems are in use (like WAAS), the 2 nautical mile accuracy is recognized as a baseline standard during the enroute segment. This level of accuracy is considered sufficient for navigational purposes when flying at cruising altitudes and speeds.

Many pilots rely on this understanding to ensure that their navigational techniques and equipment are properly aligned with the performance capabilities of the GPS systems in use. This allows for safe and efficient route planning in instrument flight operations.