http://www.soaringsafety.org/pilots/ic7.htm
Gee...look at the first signal....
I suggest you contact the soaring safety foundation and have this situation rectified immediately!
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In this country there are two standard accepted non-radio signals from
the towplane, and one from the glider:
From towplane:
- release immediately
- check your airbrakes
From glider:
- I am unable to release
Anything else is prearranged before takeoff, or else in flight over the radio.
The SSA has no influence here.