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handbook/survey/coord2.html
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p204a at the Stone Bridge</td></tr>
</table>
<figure class="onleft">
<a href='/handbook/survey/l/orthoheight.html'><img width=25% src='/handbook/survey/i/orthoheight.jpg' /></a><figcaption style="text-align: left">Click for explanation</figcaption></figure>
<figure class="onright">
<a href='/handbook/survey/l/orthoheight.html'><img width=25% src='/handbook/survey/i/orthoheight.jpg' /></a><figcaption style="text-align: right">Click for explanation</figcaption></figure>
<p>These grid references are what we use to locate the entrances and to tie in the survey of a new cave in with the rest of the 180+ km of cave and surface surveys.
<p>These might be called "dataset coordinates" in expo-speak, but note that some people historically used this to mean the coordinate system in common use on an expo many years ago, which would not be the same.
<p><em>Note that there are 6 digits starting 41... and 7 digits starting 52... This is not a mistake.</em>