[OT] altimeter calibration?

[pb3vr6 at yahoo.com (Tonee Northam)]

You have to calibrate your altimeter at take-off, during flight, and landing.
   
  So, they were probably just screwing around.

Spewey <spewey@xxxxxxxxxxx> wrote:
  Hey military/airplane people,

I've got a question for you: once when I was out sailing on a weekday
on Lake Pepin, two Minnesota National Guard C-130s flew repeatedly up
and down the lake at about 1000 ft. Big birds low down wing to wing.

The lake is about 23 miles long and 3 miles wide, actually a wide spot
in the Mississippi River, probably the biggest open water for a hundred
miles. It was an awesome sight but I presume it was not done for
jollies since they kept going back and forth.

Someone said that maybe they were calibrating their altimeters by flying
over a flat surface but I wondered how that would make sense if the
river level changes. Is that what they were doing?


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