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> Aircraft piloting/navigation also entered my thoughts, but since
> they have borrowed (stolen) almost everything (red light port, green
> light starboard, set and drift etc.) from their nautical
predecessors,

To the point that in some of the early-day aviation literature, the
aircraft is even referred to as "the ship". But I'm sure you know that
plagiarism is the most sincere form of flattery...  ;-)

And as I understand it, when a seaplane is operating on the surface
(i.e. on the water) it's bound by the same rules of the road as a
powered water vessel.

> I assumed (and have noted while flying with friends in their private
> aircraft) that they followed the same traditional navigation
> conventions for the most part as their seagoing predecessors.

It does make it a bit easier to go back and forth between the two,
though aviation's light rules are a lot simpler (hmmm.... maybe I'll
display a "vessel not under command" signal next time I go flying,
would be interesting see if anyone notices it and gets the subtlety...
;-)).

--
GregR


--- Bill  wrote:

>
> > And just to confuse the issue even further, both land and sea
> > (airplane) pilots refer to compass error as "deviation" (at least
> in
> > the USA, don't know if that's universal throughout the aviation
> world
> > or not).
>
> You seem to have it nailed, but for beginners like myself I feel I
> was a bit
> obtuse IMHO in my last post.  I always remember that "Dxxx" and
> "Vxxx" are
> different on sea and land.
>
> It is intuitively obvious, at least to me, that if I modify my
> compass
> reading by a "Dxxx" factor to reach magnetic, that "Dxxx" factor must
> be a
> magnetic distortion from from an external source(s).  Therefore
> "Vxxx"
> (variation) must by default be the difference between true and
> magnetic.
>
> Aircraft piloting/navigation also entered my thoughts, but since they
> have
> borrowed (stolen) almost everything (red light port, green light
> starboard,
> set and drift etc.) from their nautical predecessors, I assumed (and
> have
> noted while flying with friends in their private aircraft) that they
> followed the same traditional navigation conventions for the most
> part as
> their seagoing predecessors.
>
> Likewise mountain hikers that use an altimeter to assist in locating
> themselves on a topo map, while seafarers may use the depth contours
> on
> their charts.
>
> It also crossed my mind that for someone in the bush, influences from
> outside sources affecting their compass readings (barring a poorly
> placed
> flashlight, belt buckle, zipper etc.; or an iron-ore motherload or
> magnetic
> anomaly) are not generally taken into account.)
>
> I have made the mistake on a houseboat rental (well before GPS) of
> placing
> an aluminum soft drink (or adult beverage) can near the
> compass--which put
> me way off. Aluminum? Surprise.
>
> I also recall a cautionary tale in one of my texts of some outdoor
> persons
> that placed the map and compass on the hood of their vehicle at the
> trail
> head to orient the map and themselves, and later became hopelessly
> lost.  Go
> figure.
>
> Since the government put that metal plate in my head that makes me
> urinate
> every time mom turns on the microwave, I do have a Napier Diagram for
> my
> hand held compasses. (For our non-USA members, the metal plate and
> microwave
> are references to a National Lampoon comedy film.)
>
> Bill B.
>
>
> >
>


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