If your aircraft does not have DME, it must have ________.

If your aircraft does not have DME, it must have ________.

• A. GPS capability
• B. Altimeter
• C. Airspeed indicator
• D. Autopilot

Answer: (A)

Distance information is what DME provides—how far you are from a ground station. If DME isn’t available, you still need a way to determine position and distances for IFR navigation. GPS capability gives precise position data and can compute distance to any waypoint, effectively substituting for DME in RNAV-enabled aircraft. That makes GPS the practical alternative to maintain accurate navigation without DME. The other systems don’t supply this distance information: an altimeter tells you altitude, an airspeed indicator shows speed, and autopilot controls flight path.

Distance information is what DME provides—how far you are from a ground station. If DME isn’t available, you still need a way to determine position and distances for IFR navigation. GPS capability gives precise position data and can compute distance to any waypoint, effectively substituting for DME in RNAV-enabled aircraft. That makes GPS the practical alternative to maintain accurate navigation without DME.

The other systems don’t supply this distance information: an altimeter tells you altitude, an airspeed indicator shows speed, and autopilot controls flight path.