How is MOCA identified on a low enroute chart?

The identification of MOCA, or Minimum Obstruction Clearance Altitude, on a low enroute chart is represented by a "T" under the Minimum Enroute Altitude (MEA). This "T" designation indicates that the MOCA is applicable for a specific segment of the airway. MOCA provides vertical clearance over obstacles along the route, ensuring that aircraft maintain safe altitude while accounting for terrain features that may pose a risk to safe navigation.

The "T" under the MEA signifies that the MOCA offers a lower altitude than the MEA but provides the minimum required clearance over obstacles within a certain distance from the airway, typically for navigation within a specific range. This helps pilots understand the safest altitude to maintain, even in areas of potential obstruction.

In contrast, other representations, such as a star or dashed line, do not typically indicate MOCA on low enroute charts. While having no indication could suggest a lack of that information, it's important to note that the presence of the "T" is a key feature in recognizing MOCA altitudes for proper flight planning and safe route navigation.