nav, are you saying that making more guesses *improves* the accuracy of prior
guesses?

mathematically, additional guesses degrades the accuracy of prior guesses.

what's more, aircraft also make leeway and also have current and actually have
air density differences (similar effect as the tide you mention re boats)

List Jackass and listen good. DR in flying is just compass and speed. In
marine navigation it is compass, speed, leeway, current and tide. By
allowing for these variables accuracy is much greater.


Cheers

JAXAshby wrote:

jeffies, you definitely said *you* know where *you* are because you have
reference points in DR. listen to me. you do NOT have reference points in
DR.
you ONLY have where you started (and you don't even know where that is
once
you have started), your speed through the medium and which direction mag
North
is. That's it.


No jaxie, I didn't mention "known ladmarks" and I wasn't referring to
"pilotage." Its very simple: any DR plot begins with a known reference
point
called a "fix." If you knew anything about DR you would understand that.
I
would guess that most pilots know what their starting point is - that's a
reference point.




"JAXAshby" wrote in message
...

jeffies is not smart (without asking his wife) to use the word "pilotage".

he

merely said something about known ladmarks. same same.


I didn't see anywhere, where Jeff introduced "pilotage" in a way to
change the definition.

Stick to what you know. Mathematically, incorporating additional
information (even if it has some uncertainty) can inproves the error
estimate. While aircraft may make leeway and have wind that is not
usually incorportaed in theit DR. But you knew that right?

Cheers


nav, are you saying that making more guesses *improves* the accuracy of prior
guesses?

mathematically, additional guesses degrades the accuracy of prior guesses.

what's more, aircraft also make leeway and also have current and actually have
air density differences (similar effect as the tide you mention re boats)


List Jackass and listen good. DR in flying is just compass and speed. In
marine navigation it is compass, speed, leeway, current and tide. By
allowing for these variables accuracy is much greater.


Cheers

JAXAshby wrote:
nav, are you saying that making more guesses *improves* the accuracy
of prior guesses?

mathematically, additional guesses degrades the accuracy of prior
guesses.

It's a refinement of the same guess. If you know you're in a 1kt current, a
guess based purely on your steered course and speed would be less accurate
than if you refined the guess by accounting for the current.


--
Wally
www.artbywally.com
www.wally.myby.co.uk