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There's a lot of chart data that you see on a frequent basis, but here are 4 of the least common symbols.

1) Flight Services/NAVAID Name

This shaded box indicates that the flight service station and NAVAID have the same name.

2) MEA Gap

If you're flying along this route at the MEA, you could lose ground-based navigational coverage along this segment of V134.

3) Crosshatch

If you find data on an enroute chart that has crosshatching, it indicates there's an abnormal status. To figure out why, you'll have to check the NOTAMs.

4) Radial Degree

The degree symbol isn't always used, but when it is, it's to prevent the radial from being read incorrectly from different orientations. In this example, the 090 radial could be mistaken for the 060 radial, if you viewed the chart upside down.