[Milsurplus] Today's Fun Fact - NAN/NANCY infrared communications

[Nick England]

According to NAVSHIPS 900,100 of March 1946
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For years the Navy has used lights during the hours of
darkness for recognition purposes, station keeping, and
communication between ships and shore stations. There
are times, however, when any show of light might
jeopardize the security of a ship or task force, disclosing
its location and giving the enemy a target fix.

In order to carry out these functions under blackout
conditions the " Nan" Communication System was developed.
After several earlier models, the Nan Type C
was developed . This has been shortened to "Nancy",
and used to designate all Nan Systems, doing away with
the word Nan in the title and thus eliminating confusion
between it and the symbol for the letter N.
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