"Mxsmanic" wrote in message
...
How do you know when you are exactly overflying a specific spot on the
ground?
It's it just a matter of knowing your particular aircraft, or are there
tricks
that can help to determine this? I know you can look off the tip of your
wing
to see if you're abeam something (such as a runway), but how can you tell
when
you're right over something? I presume there's no way to look straight
down
from most aircraft, and it seems like the view over the nose is often
several
miles away.


When flying the F-4E in the Air Force, we would often update the INS by
flying over a ground point and hitting a button to tell the INS we were over
the point. To do this, I would roll to 90 degrees for a few seconds so we
could see the point as we crossed over it.

I think for VORs the rule is when the to/from indicator switches and for
TACAN is was when the DME stops decreasing.

Danny Deger

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