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In most charts there is the letter D next to the VOR freq. What does this mean? I assume the H and L in brackets in other charts mean high and low VORs (correct me if im wrong). But what does the D itself stand for?

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Since you're specifically referencing a Jeppesen chart, we'll go right to the source.

Jeppesen's "Introduction to Jeppesen Navigation Charts" has a glossary and explanation of all terms and symbols.

The answer to your question reads as follows:

1 — VORDME. Low and High/Low charts include a Compass Rose with VHF Navaids. Shadow box indicates navaid is airway component, with frequency, identifier, Morse code and INS coordinates. Small "D" indicates DME/TACAN. Class indicated by: (T) Terminal, (L) Low, (H) High.

So, the D indicates that the VOR has a co-located DME radio.

(and, no need for correction to your assumption: the H and L in brackets do, indeed, refer to a High or Low class of VFR)

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From the Jeppesen guide:

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7 — A letter "D" indicates DME capability with an asterisk indicating part time.

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