How do you find the limits of areas on a chart?

In article ,
Mxsmanic wrote:

Gig 601XL Builder writes:

The chart has a metric butt load of landmarks. Hell, I'd go so far to say
that it is mostly landmarks.

I don't see that many,

Then you need to have your vision checked. What do you think all that
ink on the VFR chart is for?

but even if that were true, do you really have
time to continually check them all to see how close you are to nearby
airspace boundaries, while in flight?

That depends on whether you are a competent pilot or not. But why do
you think it's necessary to "continually check them all"?

rg