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Chart Smart: low altitude IFR enroute chart intersection symbol

Think you know your IFR charts? In our Chart Smart series, we’ll put your instrument knowledge to the test with real examples from approach plates and en route charts—then break down what each symbol really means.

low altitude enroute

The letter R located within the flag at the BOOPS intersection on the V333 airway indicates a Minimum Reception Altitude (MRA) of 4,500 which is the lowest altitude at the intersection where BOOPS can be identified using the VXV VOR (116.4).

Eric Radtke