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What are the white circles before runway holding point? I tried looking on manual but couldn’t find anything

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closed as unclear what you're asking by Ralph J, fooot, GdD, Sean, Juan Jimenez May 17 at 8:00

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Can you include an illustration or photograph showing what you're referring to? $\endgroup$ – Jamiec May 16 at 16:08
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    $\begingroup$ If you can add in the particular airport you've seen them at, someone might be able to find a photograph. $\endgroup$ – BowlOfRed May 16 at 22:15
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These white circle were also marked with some range and bearing data. That means if your aircraft is in that circle, your vor and dme should read those marked values which in turn help the pilot to check serviceability/accuracy of vor dme. It’s manual version of test Vor to check accuracy of aircraft equipment.

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    $\begingroup$ Which white circles are "these white circles?" $\endgroup$ – quiet flyer May 16 at 22:04
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If they look like this one at KSJC VOR checkpoint at KSJC via google maps [https://www.google.com/maps/@37.356458,-121.9258751,158m/data=!3m1!1e3]

then it is a certified VOR receiver checkpoint. These will be listed in the chart supplement (A/FD).

San Jose (Norman Y. Mineta San Jose Intl) 114.1/SJC G 125 1.4 On runup area Twy W and D.

The Standards for Airport Markings should have information on all markings for US airports. It has this information on the design and dimensions of VOR checkpoints.

enter image description here

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