Ampere K. Hardraade wrote:
> On Saturday 30 December 2006 14:41, Dene wrote:
>> - there seems to be a N-S offset that shifts the landmass to the south.
>> This results in NZWN protruding into the harbour at the northern end
>> (where in fact there is approximately 100m of land between the end of
>> the runway and the sea)
>
> Do you know if there is a reversed effect on the Northern hemisphere?
Ran into something like this on a backcountry trip, where the origin
of the 1000-metre grid changed between two editions of the topographic
maps. The result was a 200 m discrepancy between the positions shown
on two maps for the same grid reference.
In GPS this was the difference between "Map Datum" "WGS 72" and "WGS 84"
Could this be the basis of the problem?
Cheers. Mel.
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