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Old 06-08-2018, 08:42   #31
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Re: Advice on Setting Anchor Drag Alarm

I am old and deaf, so I wired a relay inside my spare garmin chartplotter over my aft bunk up to a strobe and a siren. Only set it in squally weather. Wakes me up fine and I can see the boars track when I am restless.

Mainly trust an excellent heavy bugel anchor and 100 metres of 10 mm chain and a great snubber. Not the alarm.

If you have to use an anchor watch app every night choose a better anchorage or get a decent modern anchor and heavy chain. Else, stay awake and organise a human anchor watch.

Keith.
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Old 06-08-2018, 08:49   #32
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Re: Advice on Setting Anchor Drag Alarm

APPS are OK but we much prefer a dedicated device. We use Vesper Watchmate 850 AIS class B transponder. It has a very good anchor watch built in. It only uses about 7watts as an anchor watch. We set the watch when the anchor drops and it stays active until we depart, sometimes weeks. It logs where we are every several minutes and plots the dot on the screen.
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Old 06-08-2018, 15:06   #33
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Re: Advice on Setting Anchor Drag Alarm

Android Anchor alarm apps and other tablet type apps are not as reliable as the dedicated alarms in your marine chart plotters.
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Old 06-08-2018, 21:58   #34
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Re: Advice on Setting Anchor Drag Alarm

I feel it would be helpful, if the anchor apps running on mobile phones or tablet computer are described in a bit more in detail including the OS of the system

I use
- Anchor Pro from Peckish Sloth
- Android 7.1.1
- phone: Aquaris X5 Plus from bq

I think this app works fine but disturbing is that I get normally a few alarms with the message " no GPS data".

In a severe situation I additionally use my Raymarine C120 Chart plotter to track the movement of the boat and its anchor alarm.

The problem with the Raymarine anchor alarm is the frequency of the alarm sound. It is to high for my ears. I now bought an Raymarine interface which should allow me, among other things, to connect an external alarm.

Should someone have experience with connecting an external alarm system to the Raymarin interface, I appreciate any helpful information.
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Old 06-08-2018, 23:12   #35
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Re: Advice on Setting Anchor Drag Alarm

Most of the chart plotter alarms are too soft or the wrong frequency for those of us who are aurally challenged.

Also, most dragging occurs during very windy, rainy, noisy times, so this makes alarms hard to hear. Most chart plotters and alarms are in the cockpit or nav area, I sleep in the aft cabin, too far away to hear them.

My solution was to buy a stand alone garmin chart plotter, have an electronics expert wire an internal relay to switch an output line to a cheap strobe siren combination mounted directly under the hatch over the aft bunk where I sleep. When the drag alarm goes off I hear it and see it, even without my hearing aid in and I am asleep. It also helps to see the boat position and speed etc when under way and the crew is on watch and I am sleeping or resting in the aft cabin. The raymarin plotters do not have this facility, technician said. My radar, furuno, has a similar smaller external piezio buzzer for the guard alarm, easy to hear and hard to ignore!

It really works, does not rely on a phone battery, cheap, reliable, very noisy and bright. Cannot be ignored. I have a similar strobe/siren for my bilge pump alarm and a lesser one for my motor watch on oil pressure, temperature and exhaust temperature( engine watchdog, an aussie product)

My buddy who was sleeping in the cockpit of his cat in Lagundri bay , nias, west sumatra, so he could hear the anchor drag alarm. slept through it for 35 minutes and nearly ended up on the rocks in the huge surf on the lee shore on the eastern side of the bay. A fisherman woke him by shouting and banging on the hull, only a few boat lengths from disaster. Had his pregnant wife and 3 yo daughter aboard. They sold the cat very soon after and live on land now!

I relax at anchor.

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Old 10-08-2018, 03:03   #36
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Re: Advice on Setting Anchor Drag Alarm

The chartplotter app OpenCPN (available on android, Mac & Windoze) incorporates an excellent anchor alarm. Not only can you set your anchor position and size of swing circle, you can also define nearby hazards so that an alarm sounds if you drift closer to them than a distance of your choosing.
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