During my commercial training I am learning much more about how our Indicated Altitude can have errors due to non-standard atmospheric conditions. We set our altimeter to nearest available setting which takes care of much of the variance between true altitude and indicated altitude. But when we are flying along on our XC on a nonstandard day how do we make sure we are not going to bump into things up there? During my PPL training we talked very little about variances between true altitude and Indicated. On my charts we would ensure that we were at least 500' above any obstacle along the way. But is that really enough? If we are 25C off of a standard day couldn't that 500' be reduced to 10'? Also what about staying below/above airspaces? Isnt ATC going off of True Altitude? Could I bust bravo or the SFRA(in the DC Area) due to these errors?
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