Thank you.  I do appreciate that. Look at this from a scripter's point of view ... mine.  We have two nested requirements.  First, make sure that you can't make the unit operate if it is placed anywhere between 100m and 2000m altitude.  That's easy.  Those are fixed altitudes. Whenever someone turns the unit on or moves it, check to see where it is. If it's between 100m and 2000m, go no farther.  Second, make the unit sense things no further than 400m above or below itself.  Those are relat
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