VOR Cone of Confusion

I recently got an email from a user of Nav Trainer asking what the red lines represent on the sides of the VOR station symbols.

Those red lines represent areas where the VOR signal is ambiguous and the VOR display is unreliable.

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Stop chasing the needles!

A very common problem with new pilots is over-controlling the airplane, or “chasing the needles.” For example, cruising at 5,000 feet, a new pilot might notice the altitude increases a little bit, so he abruptly pushes the yoke forward in an effort to correct the deviation. He pushes a little bit too much, and the aircraft, previously climbing, starts descending. What does our pilot do? He over corrects again, in the other direction, and the aircraft climbs again.
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Deciphering RNAV approach minimas

GPS and RNAV approach terminology can be very confusing since modern RNAV procedures usually accommodate more than one type of navigational equipment (such as basic GPS, WAAS, LAAS or multi-sensor FMS) on the same chart. With older types of approach procedures, the specific equipment required is stated in the chart title. For example, you could only fly a “VOR RWY XX” approach with VOR equipment, or an ILS approach with ILS equipment.

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