Ric,

That sounds like it could work with my handheld GPS, with it and the GPS
powered by boat's battery. Of course my GPS 48 has no alarm-out connection.
But, I wonder how hard it would be to open the GPS case and find the
internal audible alarm device contacts and give it a try. If successful, I
could install some sort of permanent connector thru the case. Whadda
think??? Ric or anyone, please provide any tips, do's/don'ts.

I'd plan to use a three-wire alarm, where very low current (5ma) operates
the trigger and the alarm itself is powered by boat's battery.

Your 420's a really fancy machine and I couldn't agree more about it being
dumb not to have an external alarm connect on it. All the internal alarms
are useless as far as I can tell. (Perhaps that's because there are no tides
and few currents and winds affecting anchored boats in Kansas, or maybe
people don't sleep on boats there.)

Thanks,
Len


--
You don't mention what kind of GPS you have - but are you sure there is no
means to connect an external alarm? My GPS (a Raymarine 420) had a totally
useless "alarm" that wouldn't wake a sleeping mouse, so I pulled it to
bits
and connected an external alarm. I subsequently discovered that Raymarine
will actually do this as a free after market mod, realising that it was a
bit dumb to ever build something with an inaudible alarm.