Sectional Chart symbol question

[Margaret Wolf]

What does this symbol mean? Thanks.

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[msinger]

It would be helpful if you could show us which symbol you're referring to.

 

[joet]

If you mean the "23", it means that there is known to be an obstruction (natural or man made) reaching up to 2300 feet MSL.

 

[Margaret Wolf]

D'oh. Sorry. Yes its the large 2 and the smaller 3. Thank you JoeT.

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[Phantom4Flyer]

If you mean the little yellow area in the upper third,at the tip of the arrow you drew, it's just a populated area - I'm not sure what the threshold is. Look at the larger yellow areas and notice they are towns.

 

[Margaret Wolf]

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[Margaret Wolf]

And what is the circle with the hashmarks. It looks like the face of a watch.

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[Margaret Wolf]

There is a NOTAM note in it.

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[Sohumvet]

And what is the circle with the hashmarks. It looks like the face of a watch.

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That's a VOR. A navigational radio transmitter.

 

[Phantom4Flyer]

Look at the center of that circle, and notice the symbol which is a VOR, a VHF radio navigation station (actually a VORTAC), which sends out a signal that lets the pilot know which radial of that station he is on. If you draw a line from the VOR to the airplane location, where it crosses that circle determines what radial the airplane is on. Radials are in degrees from 0 to 360. If it's a VORTAC (as this one is) you also get range to the station.

The blue box has the name of the station (Sioux Falls) and frequency.

Look it up on Wikipedia for more details