I have one with an external connection. I hard wired a large piezo
buzzer (Low power draw LOUD alarm-radio shack) it works great... if you
find the right GPS here are a couple hints....
-Put a switch inline with it... When mine goes off I get up but by the
time I get up to the bridge, I have woken the whole crew....A timer
switch is better because it resets itself.... otherwise put it somewhere
you won't forget to turn it on at night...
-make sure you use it during the daytime to get an idea of the
sensitivity needed... Mine was waking me up all the time in the begining
until I figured out how to use it with changing tides etc. 2 anchors
(Main and a kedge against the shore) work best for my vessel
-My next project is to add a motion detector to the cockpit area to
alert me to anyone boarding, exiting (Afraid of newbies falling over) or
trying to steal my dingy.




Len Krauss wrote:

My GPS (with an anchor drag alarm feature) is not located in sleeping berth.
Even even if it were, its alarm is barely audible, and certainly not
adequate to arouse a person from a sound sleep (unless the GPS were strapped
to one's ear.). Additionally, a GPS antenna wire would need to be run to the
berth -- not a big problem, but what's the point if one can't hear the alarm
anyway.

Perhaps there's some kind low-power amplifier that could be placed next to
the GPS, or possibly a transmitter with remote alarm receiver. But it might
need to be tunable, so just any kind of noise doesn't set it off.

I was hoping that there might be a defined NMEA sentence output by the GPS
when an anchor drag condition is sensed, but none exits from what I've been
told. If there were, it might be possible to detect it in order to trigger a
loud alarm of some type.

Would welcome any and all suggestions for off-the-shelf or custom anchor
drag alarm systems.

Thanks,
Len