I think we'd just need a laser, that would dissipate the light such that it spread and the beam dissipated below a certain altitude.
Still, with the restriction, I think it would bear an in depth examination, and possible contact with the FCC to discover the exact limitations required to be legal with such a device as we know laser pointers are used in classrooms, and as cat toys and if it was a problem pointing them into the sky, most of use would have been arrested by now. Obviously this device was meant to 'virtually' touch the stellar object where one would see it with the naked eye, or meant to be attached to a telescope to give one the superior locating power found in more expensive telescopes.
I then had a few thoughts 1: Perhaps a lower strength laser, that would maybe make a slightly visible but lower powered finger, or 2: using a red-dot pointer, like those on telescopes which are small, virtual pointing devices that don't actually emit a beam, or do, but only visible as a pointing scope, and obviously legal, or 3: use a pointing stick with crosshairs that one could merely sight along to see where it's pointing.
When I first read this, I had an image of looking out over the night sky and seeing amateur astronomers with galileo's Fingers pointing up at various stellar objects as if saying, night sky lovers live here, only to be replaced by an image of Uncle Sam and his finger smashing mallet crushing my blissful scene.
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