[Milsurplus] What is this optic item on Craigslist

[John Vendely]

Looks like a driftmeter, or "driftsight", an optical device used for 
measuring an aircraft's wind drift during over-water navigation.  
They're usually gyro-stabilized, with a graticule used for measuring the 
aircraft's ground track angle with respect to waves on the ocean 
surface, which are an indication of surface wind direction...

73,

John K9WT

On 5/4/2013 11:39 AM, R PRECHTL K7DFW wrote:
> Claimed to be for aircraft use.
>
> What is this?
>
>
> http://portland.craigslist.org/mlt/atq/3763216348.html
>
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>
>
> RP
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