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Date: Thu, 29 Oct 1998 09:15:27 +1100
To: techdiver@aquanaut.com
From: Stephen Gillies <max@ma*.ne*.au*>
Subject: magnetic islands

>> Some day we may discover how to make magnets that can point
>> in any direction.
>
>Any u/w compass rather adjacent to the odd few steels? :-)

 slightly off the topic, but a story none the less. When I was
 doing my dive master, I chose a small island in Sydney to map
 called Bare Island. It's the site of one of Sydney's first
 (and only) forts at La perouse (the first landing place of 
 Captain Cook).

 Anyway it's joined to the mainland by a bridge, and is maybe
 70 metres (ummm 230'?) wide at the widest point. anyway 
 I took compass barings when I started and did the western 
 side. as the front of the island (south) is divable only in 
 good weather, I did the eastern side next followed by the
 shallow and choppy section under the bridge.

 Finally when I did the front I was most concerned that the
 island on my map was nowhere near the same shape as the
 real island, and that the two sides didn't join!

 After MUCH discussion (and re-diving the site, taking barings
 again and again with different compasses) I found out that
 the island is one of Sydney's magnetic islands. 

 Doh.


 MAx.
max@ma*.ne*.au*	
---
Some day we may discover how to make magnets that can point
in any direction.






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