The problem that I see with the "electric fencer" idea is that on
fiberglass boats there is no ground return path. Having installed
a few electric fencers in the past, I can tell you that normally the
fencer ground is connected to a metal stake driven deep into the
earth. Then when someone touches the wire of the fence, the dirt
they are standing on makes the return path. I'm not sure that fiberglass
would conduct enough for someone standing on the deck to get much of
a shock from touching an energized railing. It might.

Now on a steel, or aluminum boat... ;-) Of course, you would then have
to electrically insulate the railings from the rest of the boat. And that
fencer is going to really annoy your neighbors whenever someone trys
to use the radio.

Later,

Don W.



Kiyu wrote:
On Sun, 9 Nov 2003 20:08:43 -0700, "Bob La Londe"
wrote:


There are a couple guys who hang out in news:alt.security.alarms who have
done some really comprehensive boat alarms including monitoring using
cellular communications designed for alarm purposes.

Obviously communications may not work when off the coast of some desert
island in the middle of nowhere, but it works well when at your home
anchorage.


Although this isn't an alarm as such, more along the lines of
intrusion prevention for foreign anchorages, while doing a Google
search the other day I found where someone sells an electric fence
charger/energizer for boat railings. With a bit of imagination I would
think satisfactory electrical return paths could be worked out to
allow use of a standard cattle unit.
Certainly has a lot of appeal and beats Slocum's carpet tacks.
The attempted intruder also acts as his own alarm as the YELP should
be able to be heard for some distance. (judging from my own first
encounter with an electric fence..."Now how bad can this be?")

Kiyu



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