The slaved compass is corrected so as many errors
(deviation) are corrected and variation is also corrected as
much as possible too, so the slaved compass may be reading
different from the whiskey compass unless you apply the
compass correction card FOR-Steer to get a more accurate
setting for the HI. But the whiskey compass is not supposed
to have any error greater than 10 on any heading. Often the
compass is swung with the electrical and radios running. It
seems that swinging the compass should be done with the
electrical system dead and the radios off, that is when I'd
want the most accurate magnetic compass.


"Peter R." wrote in message
...
| Jim Macklin wrote:
|
| Actual runway details are on the instrument approach
charts,
| including direction to the degree and elevation and
slope.
|
| Yep, I am aware of that. I was curious whether it is
common for pilots to
| pull out their instrument charts after learning of or
deciding upon what
| runway is in use/to use at an unfamiliar airport. It
seems to me that with
| the workload of pre-taxi, taxi, and pre-takeoff
checklists, this item is
| probably not a task many pilots perform. Or do they?
|
| In my case I have a slaved HSI in my Bonanza, so I had
been quickly
| comparing the HSI heading to the runway number to see if
it is within ten
| or so degrees of the runway number as part of the "lights,
camera, action"
| taking-the-runway mnemonic.
|
| --
| Peter