In article vViQb.58525$zs4.35677@fed1read01,
"BTIZ" wrote:

because the MSL altitude of the ground is to high above sea level and it
can't be turned down that far to "zero"..

we have the same problem with flat land sail plane pilots.. if I set my
local altimeter to zero.. which I can't because it's to far to go.. beyond
the adjustment range of the altimeter.. then how do I know I'm high enough
to clear the local mountains.. or if my landing airport is still 2500ft
above the airport I take off from.. I have to do the mental math calculation
to know my AGL altitude.


He's talking about doing acro over the field...not making a
cross-country.

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html