"Teacherjh" wrote in message
It's +/-100 feet, which is a total range for
200 ft. [for IFR flight tolerances]

I was taught that it was +/- 300 feet and you violated seperation standards
with another IFR target. What is your reference?


It's what I was taught. I think it's also in the PTS for instrument flight
(though I don't have one handy). I haven't found it in a printed reference.

Jose

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