81 =========== Bob Gibbons *AT* Texas Soaring Association (TSA), Dallas, TX
One of the most used parameters, particularily in the winter months

101 =========== ---------- *AT* Ellenville, NY
Isn't this the same as BL Top??????? If not what is the difference?

The surface height is included in the BL top.

132 =========== Bob Ireland *AT* Williams, CA

147 =========== Rolf Beyer *AT* Harris Hill, Elmira, NY
I really have not studied this parameter