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I have seen this trick before - it just works on the fact that 200 - 20 =
180

It seems to work with all bearings:

If bearing starts with 3 or 2 (eg 322 or 245) then subtract 200 and add 20
If bearing starts with 1 or 0 (eg 122 or 035) then add 200 and subtract 20

eg 006 add 200 = 206 subtract 20 = 186

So there is no dead band as such - you just have to do it in two stages

There is, however, a problem between 181 and 199 as the result will be over
360 so you will have to adjust accordingly

Probably easier than adding or subtracting 180 in your head

Paul Bryans
----- Original Message -----
From: "cfi@licfi.com" 
To: 
Sent: Thursday, April 06, 2006 4:45 PM
Subject: Re: Compass card with more than 360 degrees


> Lu,
> When I first saw the message header:
>  "Re: Compass card with more than 360 degrees"
> I thought someone was going to bring up the Locars(SP?)Compass.
> That was a Compass that got some press about 1976 or so - it went from 0
> to 400 degrees - to make recprical bearings "easyer" no body got behind
> it though, and it went away. FYI: I teach flying & use this neat trick for
> reciprical headings:
>
>         " The 2 + 2 Methode " :
>
> Example:
>  If heading is 095 what is the recip?
> answer: can you add 2 to the first number and get less than 4?
>        if so do it and then subtract 2 from the next number the
>        third number will stay the same....
>
>                    0   9  5
>                    +2 -2  =
>                   ___________
>                    2   7  5
>
> Going back in the other direction recp of 275:
>
>
>                   2    7   5
>                  -2   +2   =
>                 ________________
>                   0    9   5
>
> It's not fool proof there is a 'dead band' between 000 & 019 degrees
> that doesn't work. Try it.
>                         -Greg
>
>
>
>
> --------------------------------------------------------------------
> mail2web - Check your email from the web at
> http://mail2web.com/ .
>

   

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