Cross BOI 40 miles to the south at 17,000

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jdoumak2@cox.net
Posts: 13
Joined: Mon Nov 02, 2020 6:06 pm

Cross BOI 40 miles to the south at 17,000

Post by jdoumak2@cox.net »

I am getting into IFR from KMMH to KBOI and filed the flight plan NIKOL2 NIKOL RYANN REO J7 BOI and picked up the clearance enroute. As I was descending into KBOI passed the REO VOR, the controller told me to cross the BOI VOR 40 miles to the south at 17,000. Without a fix or heading, I don't know how to calculate this. I was on V113 at the time just after crossing REO. I was too embarrassed to admit I didn't know how to calculate that so I disconnected and came here.

Where can I learn this?
Kevin_atc
Posts: 2039
Joined: Sat Nov 13, 2010 7:01 pm

Re: Cross BOI 40 miles to the south at 17,000

Post by Kevin_atc »

Most GPS/FMS computers have the capability to add a point in there. However, even without a GPS/FMS, it’s just some basic math taking into account the distance remaining, ground speed and desired descent rate. Pretend you were told to cross the VOR at a certain altitude. Now, subtract 40 miles from that equation and you have your answer.

Discord would be a good place to discuss this further. Details below.
Kevin
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jdoumak2@cox.net
Posts: 13
Joined: Mon Nov 02, 2020 6:06 pm

Re: Cross BOI 40 miles to the south at 17,000

Post by jdoumak2@cox.net »

Thanks Kevin. I will try to learn this going to discord and redo the flight.
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