What does the term "MTR" stand for in the context of aeronautical charts?

The term "MTR" stands for Military Training Route. These routes are established by the military to facilitate the training of military pilots in a safe and controlled environment. They are designed for the purpose of conducting low-altitude navigation training and may involve operations at altitudes as low as 100 feet above ground level. The existence of these routes helps ensure that military aircraft can train effectively while maintaining the safety of both military and civilian operations in the airspace.

Military Training Routes are depicted on aeronautical charts and include specific symbols and annotations that indicate their nature and usage. Pilots are advised to be aware of these routes to enhance situational awareness and to avoid potential conflicts with military operations.