Which method can be used to determine if on profile for an ELP?

The DME method is the correct approach for determining if an aircraft is on profile for an Electronic Landing Procedure (ELP). This method leverages Distance Measuring Equipment (DME) to assess the aircraft's positional data with respect to the specified profile for the approach and landing.

By using the DME, pilots can receive precise distance information that assists in maintaining the correct glide slope and approach parameters. This helps ensure that the transition from the en route phase to the approach phase is executed safely and efficiently, allowing adjustments to be made if necessary to stay on profile.

While manual calculations, visual observation, and flight path simulations can provide insights, they may not offer the immediacy or accuracy required for monitoring an active ELP in real time like the DME method does. Thus, the DME method is essential for accurate situational awareness during the approach phase.