Mxsmanic wrote in
:

writes:

What is the practical difference between "above, but not
including" (e.g., +12) and "above and including" (e.g., 12)?

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.


Wrong

Bertie