Is the tetrahedron at an airport:

1) Supposed to be pinned down to show active runway
2) Allowed to be pinned down to show active runway
3) Supposed to pivot freely with the wind direction

(Background: our club has a long-standing policy to anchor the
tetrahedron. Some of us are really scratching our heads about this
policy and would like to change it. We already know that "the
tetrahedron is not a wind indicator".)

~ted/2NO