Minimum Obstruction Clearance Altitude (MOCA) is depicted on a chart by which feature?

Minimum Obstruction Clearance Altitude (MOCA) is depicted on a chart by which feature?

• A. Has an * at the Start of the Numbers, Usually Below the MEA Numbers on a Route
• B. Has a # Symbol at End
• C. Shown as a Bold Line
• D. Identified by a Color Change to Purple

Answer: (A)

MOCA is shown on IFR en route charts with a star placed at the beginning of the MOCA altitude figures on the airway segment, and these MOCA numbers are usually printed below the MEA numbers on the route. This star marks the altitude that guarantees obstacle clearance along the route within 100 nautical miles of a VOR, which is why the depiction uses a star rather than a different symbol or style. Beyond 100 miles from the VOR, MOCA no longer guarantees reception of the VOR, so pilots rely on the MEA for navigation signal coverage while still needing the MOCA only for obstacle clearance within the 100 NM range. The other depicted styles (a symbol at the end, a bold line, or a color change) are not how MOCA is indicated.

MOCA is shown on IFR en route charts with a star placed at the beginning of the MOCA altitude figures on the airway segment, and these MOCA numbers are usually printed below the MEA numbers on the route. This star marks the altitude that guarantees obstacle clearance along the route within 100 nautical miles of a VOR, which is why the depiction uses a star rather than a different symbol or style. Beyond 100 miles from the VOR, MOCA no longer guarantees reception of the VOR, so pilots rely on the MEA for navigation signal coverage while still needing the MOCA only for obstacle clearance within the 100 NM range. The other depicted styles (a symbol at the end, a bold line, or a color change) are not how MOCA is indicated.