Which statement is true about the signal range of DME?

The statement that reliable signals from DME (Distance Measuring Equipment) may be received at distances up to 199 nautical miles is true. DME is designed to operate effectively at longer ranges, with a maximum reliable range typically around 199 NM. This capability allows pilots to gauge distances accurately from stations well beyond the immediate vicinity of the VORTAC facility.

DME provides operational advantages for navigation by allowing pilots to determine their distance from the ground-based DME station, effectively enhancing situational awareness and navigation accuracy over long distances. This feature is particularly useful for en route navigation as well as in terminal areas, where precise distance measurement is crucial for safe flight operations.

In understanding the range, it's essential to note that while some equipment may have operational limitations based on geographical or atmospheric conditions, DME is built for reliability within that specified range under appropriate conditions. The emphasis on a 199 NM capability reflects the engineering and operational standards set for navigation aids like DME.