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Re: Is this group about amateur radio in the UK?

"Walt Davidson" <g3nyy@invalid.invalid> wrote in message
news:qjl05597h79losjqa24op593u8ph9us5kp@4ax.com...
> On Sun, 5 Jul 2009 07:00:14 +0100, "Brian Reay"
> <seewebsite@invalid.com> wrote:
>
>>> NDBs are NAVIGATION BEACONS
>>
>>Actually the N in NDB is for Non (as in Non-Directional Beacon).   They
>>are,
>>in the scheme of things, a very crude nav. aid when compared to the sort
>>of
>>thing I was involved in which, in the main, had some sort of inertial
>>based
>>unit as their focus.
>
> In fact they are far from "crude nav aids".  NDBs are an integral part
> of the NDB/DME system, which - together with VOR -  is the standard
> airport approach method for aircraft operating under Instrument Flight
> Rules.


They will get an aircraft in the area of a airfield but that is quite
different to the sorts of accuracy required for some applications.  Plus, of
course, in time of war the various ground based beacons (and even GPS) may
not be available.

Why on earth do you think things like Laser IN systems, GPS, and terrain
referenced navigation systems  were designed?

If you don't wish to believe me, fine.

--
73
Brian G8OSN/W8OSN
www.g8osn.org.uk

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