What happens to the display when DME hold mode is selected?

When DME hold mode is selected, the display indicates this change by replacing the green navigation mode (NM) indication with an amber "H." This amber "H" signifies that the aircraft is holding on to the Distance Measuring Equipment (DME) and is not currently navigating away from this reference point. The presence of the amber "H" alert is crucial for pilots, as it serves as a visual cue that the aircraft is in a different operational mode, specifically indicating that the DME is being utilized for holding rather than active navigation use. This visual confirmation helps ensure that pilots are aware of their current position relative to the navigation system and can make informed decisions based on that information.