Quoted from my personal notes I keepâ€¦

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When to Descend.

Using trigonometry to calculate â€¦

1mile = 5280ft thereforeâ€¦

3deg glide = 277ft per mile.

4deg glide = 369ft per mile.

5deg glide = 462ft per mile.

Remember though that airfields quite often arenâ€™t at zero ft, so use AGL or subtract the airport altitude from your actual altitude.

Most approaches will be a 3Â° glide slope. A quick and convenient way to calculate these in your head isâ€¦

If you multiply your distance from the airport by 300 and add it to field elevation.

Example:

SXM airport elevation is 26 ft

3 miles from SXM you should be 900 feet

2 miles from SXM you should be 600 feet

1 mile â€¦"â€¦" 300 feet

1/2mile â€¦"â€¦" 150 feet

Another tip on long decent and knowing when to start decending isâ€¦

Multiply altitude by 3 so 22000 x 3 = 68000 remove the 0s, your then left with 68, so you would descend 68nm from your desired airport. For the VS divide your ground speed by 2 which can be found in the bottom left corner of your HUD display. so of your ground speed was say 300 KTS you would descend at -1500 FPM

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Ps your icon appears normally to me, and Iâ€™m guessing to others. Might be a glitch with your browser.