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[aprssig] Cave Surveying

AA3JY at Winlink.org AA3JY at Winlink.org
Tue Nov 20 15:56:46 UTC 2012

Some have short memories..but I posted this back in September:


What is used to help facilitate surveying in cave diving(water medium) in north Florida..a Pinger device in the 350hz range.

Clay AA3JY

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