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Geoffrey Kolbe wrote

>A glance at the atlas
>>shows that a position five miles North and East of Trondheim (where Asbjorn
>>would have to be to get an observed altitude 5 minutes less than
>>calculated) would put him in Trondheims Fjord....!
>>
>>Asbjorn would appear to be where he thinks he is.
>
>Response from George-
>
>Not necessarily so. He would not have to be at the place that Geoffrey has
>specified, to get an observed altitude 5 minutes less than calculated.
>Anywhere on a position line passing through that point, and perpendicular
>to the Sun's azimuth, would fit his observation. So he would not have to be
>in Trondheim's Fjord. Still, it would be useful if Asbjorn would confirm
>(or not) whether that GPS position corresponds well to his place of
>observation.

Thankyou for that observation George. You are of course, quite correct.

Geoffrey Kolbe

   

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