I used the Garmin
128 for 10 years, worked great with an external buzzer. One of the early car seat-belt buzzers.
But it died and I could only replace it with a Garmin
152H. Its alarm beeps 3 beeps and quits. So I had to add a latching relay. In 15 years of cruising, the anchor drag alarms have saved us numerous times in Mexico
, all across the South Pacific
an now Southeast Asia
. A 30 knot
squal in th emiddle of the night will at least cause most anchors to reset. The black& white display Garmins use less than 0.2 amps so it stays on 24 hours a day, even where there is no cell phone