F1y1n wrote:
....

whether or not the glider is flying straight and level.


No.

Besides, exactly how many gliders are flying with Mode C right now?
Maybe one 1-26 in North Dakota?

In the USA, hundreds, at least, but mostly in the southwest and eastern
parts of the country. Stick your nose into the cockpits at Minden, for
starters. Once the Microair and Becker became available, they were
flying off the shelves at Wings & Wheels, Knauff & Grove, and elsewhere.
Motorgliders are much more likely to have them, also. In our ASH 26 E
owners group, I think about half of the 30 owners have Mode C.

By the time the 1-26 in North Dakota has one, the rest of us will have
moved onto Mode S.

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Eric Greenwell
Washington State
USA