Therefore, unless pilots plan to miss controlled airspace by a minimum of 5nm they have to have something else to use which enables more accurate navigation eg a line feature etc etc especially when visibility is not good.
Far too many PPL's measure a VOR radial from a 1:500,000 chart that misses a control zone by 1 or 2nm and despite the fact that the VOR is some 20, 30 or more miles away make no allowance for either the system errors that can cause them to be in the zone even when the VOR says they are not.
Given that some of the tighter areas of Class G are less than 10nm wide in places, that's a good trick if you can do it.
For those of you talking about GPS training courses, I went to one recently. It was about using the Garmin 430/530.
Given that some of us are using Pilot III or even Garmin 55s without moving maps, I think it would have to be a very generic course as each of us have different problems.