In article ,
says...



I think it serves when you have two airspaces with no margin between them.
For exampple, one is 12/SFC, the other is 70/12+. So at 1200 feet you're in
one airspace, and at 1201 feet, you're in the other. If they were specified
as 11/SFC and 70/12, the space between 1101 feet and 1199 feet inclusive would
be outside either airspace.



Trying to read between the lines of this incredibly weird post, it would appear
the writer is suffering from the illusion that "fractional" airspace altitudes
in a given segment are indicated both for the charted (Class B) airspace and
for the underlying (Class E). Readers should be advised of the fact that this
expert, offering his "presumptions" may never have seen a sectional chart, and
certainly has never studied the subject - does not know how to read the chart.

The original poster, writing for information or clarification, should be
advised that use or application of any information gleaned from this expert
could lead to hazardous in-flight conditions . . .