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Wolfgang,

> the person that is in the red spot
> sees a bright flash of sunlight.

Heliotrope was apparently designed to send a signal
to the large distance when you see neither the red spot
not the person. (The sizes of geodesic triangles are
frequently more than 10 miles).
How about signaling from a yacht to an airplane,
for example?

> or the direction where you want to send your signal is
> not towards the sun

And this too. It seems to me that this simple extra mirror
(especially if it can be easily attached and detached from
a sextant) would make a very good addition to a survival
kit.

I've heard that simple heliotrops are also
used in the long mountaneering expeditions, where
the supplies a dropped from an airplane.
This is a simplest way to indicate your location
to an airplane on a sunny day. But they are probably
pointed in some more sophisticated way than looking at
a red spot on the target.

Alex.


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