ILS Glideslope Height RNAV

For ILSILS —Instrument Landing System glideslope height questions, there are three methods to solve the problem:

  1. Use trigonometry. This gives the most accurate answer, but is time consuming and requires converting between nautical miles and feet.
  2. Use RA=60DRA = 60D; this is slightly quicker and slightly less accurate, but also requires converting units.
  3. Know that for every 1 nm on a 3° glideslope, your height will be 300 ft. This is the fastest and most efficient way.

To use the fastest and most efficient method:

  1. Multiply the number of nautical miles from touchdown you are by 100.
  2. Multiply the answer by your glideslope.

This will give you your height.

Expressed as a formula, this is h=100RGh = 100RG where hh is your height in feet, RR is the number of nautical miles from touchdown, GG is your glideslope.

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What is your approximate height above ground at 6.21 nm DMEDME —Distance Measuring Equipment on an ILSILS —Instrument Landing System glideslope of 3.4°?
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