ILS Glideslope Height RNAV
For ILSILS —Instrument Landing System glideslope height questions, there are three methods to solve the problem:
- Use trigonometry. This gives the most accurate answer, but is time consuming and requires converting between nautical miles and feet.
- Use ; this is slightly quicker and slightly less accurate, but also requires converting units.
- 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:
- Multiply the number of nautical miles from touchdown you are by 100.
- Multiply the answer by your glideslope.
This will give you your height.
Expressed as a formula, this is where is your height in feet, is the number of nautical miles from touchdown, is your glideslope.
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Prefer multiple choice questions
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°?