In article , says...


In article ,
BillJ wrote:

I thought I understood everything that could be on a sectional, but
before a trip to New York City airspace, I studied the sectional and
terminal area charts a little extra carefully. Just southwest of Newark
(EWR) (and also other places) there is a notation such as 70/+12 in blue
for the floor and ceiling of class B airspace. What does the "+" mean? I
went to the aeronautical chart users guide which has lots of symbols but
not this. They do mention a "-" means up to but not including in one
example not having to do with floor and ceilings, but what could does
this mean for a floor? AGL?

It means exactly the same as the "-" does for a ceiling; the airspace
includes all altitudes above (but not including) 1200 MSL, and up to (and
including) 7000 MSL.

In theory, it means you are legal to fly at 1199 feet talking to nobody
while ATC runs a heavy jet 1 foot above your head at 1200. In practice, it
means if you want to go below the CBAS, do it at 1100.




"Upward from above" is the term used on the TAC.
In other words, (IIUC) it means you can operate at 1200 feet talkiing to
nobody, while ATC runs a heavy jet 1 foot over your head at 1201, where CBAS
begins . . .