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    Re: Fatal interaction between yacht and ferry.
    From: Bill B
    Date: 2007 May 09, 14:12 -0400

     > I'm guessing that the beamwidth (radians) is on the order of 1 over the
    > width of the reflector expressed in wavelengths. So at X band (3 cm
    > wavelength), a reflector 30 cm aross will have a beamwidth of roughly
    > 1/10 radian, or 6 degrees.
    A bit of a stretch. but I'll go with the notion radar has been around long
    enough to qualify as "traditional navigation" so a topic for prolonged
    technical discussion.
    Radio even longer, thanks to Russian Alexander Popov refining the work of
    James Maxwell and Heinrich Hertz.  (Credit to Alex for pointing this and
    revisionist history out to me.)
    My question stands.  You can see the craft--why not radio it???
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