"Ronald Raygun" <no.spam@[EMAIL PROTECTED]
> wrote in message
news:cECXj.4992$DZ6.1544@[EMAIL PROTECTED]
> TonyB wrote:
>
>> On my chart Imray G11 I have a compass rose which shows in writing
>> "Variation 2º 45' E (2005) Increasing about 5' annually."
>>
>> Fine. But the compass rose points to 5º on the true north ring rather
>> than
>> 2.45 - why is this?
>
> Here are some possible reasons.
>
> 1) The orientation of the rose is wrong.
>
> 2) The writing is wrong.
>
> 3) They're both wrong.
>
> 4) Their compass rose printing technology doesn't handle arbitrary
> rotation, only whole multiples of 5º.
>
> 5) They expect the chart to have a life of 50 years or so, and
> printed the rose as showing the mean direction for the period.
>
> 6) They issued a new edition of the chart in 2032, but without
> updating the writing on the rose, since there was no need, as it
> was still correct. This is your grandson's chart who paid you
> a flying visit from the future, and brought it back to show you,
> then forgot to take it with him when he went back.
>
> I wouldn't bother with this Mickey Mouse stuff. I've yet to see an
> Imray chart which can hold a candle to Admiralty ones.
>
Thanks Ron, good points to consider. All of the first four are possible I
guess,
five is most unlikely as my edition was published in 2004 and they've
since
issued a new one
in 2008 so that makes the first three more likely.
6 is most improbable. Mainly because I have yet to have children as far as
I
know - of course a wild youthful moment
back in the seventies may yet tap on my door to surprise me. A vasectomy
should have taken care of any future
progeny, allowing the wilder moments of my maturity without the worry of a
tap on the door in my
retirement years.
Must have a look at an Admiralty chart and see if they're as good as you
say.
Thanks again,
TonyB
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