[aprssig] Cave Surveying

[Keith VE7GDH]

Clay AA3JY wrote...

> Some have short memories..but I posted this back in September:
> www.tapr.org/pipermail/aprssig/2012-September/040466.html
> What is used to help facilitate surveying in cave diving(water
> medium) in north Florida..a Pinger device in the 350hz range.

Could you please give a short description on how the Pinger is
used? I assume the diver / spelunker would have the transmitter.
How does the receiver determine the Pinger's location?

73 es cul - Keith VE7GDH
--
"I may be lost, but I know exactly where I am!"