Wireless Engine Cut-Off Switches Evolve Into Man-Overboard Alarm Systems

A 2021 federal law mandating proper use of engine cut-off switches has led to a boom in wireless alternatives to the safety lanyard. Sailors beware of the caveats in man-overboard protection.

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Six systems now go well beyond the traditional kill-switch lanyard—the latest, including Garmin's OnBoard (center), pair a hard-wired hub with wearable fobs and chartplotter or app integration to log MOB positions and guide crew back to the person in the water. (Images/ Propeller Guard, Fell Marine, 1st Mate, ACR Electronics, Garmin)

Even sailing greenhorns are familiar with those red coiled lanyards that are, theoretically, attached from an engine’s cut-off switch (ECOS) to the operator’s life jacket (or, more likely, belt loop).

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Doug Henschen has been sailing in and around the waters of the lower Hudson River, New York Harbor, and the Long Island Sound since the 1980s. A career editor and journalist, Doug served as associate editor and managing editor of The Waterway Guide from 1984 until 1987 and as executive editor of Boating Industry magazine from 1990 to 1996. Doug is a member of Sail America and is American Boat and Yacht Council (ABYC) certified on Marine Systems, Marine Electrical, Corrosion Mitigation, Disaster Avoidance, Outboard Repowering Considerations, and Boatyard Basics.

4 COMMENTS

  1. I had the ACR OLAS system installed on my recently sold trawler. I am often a solo boater. My tag was in captain mode (overboard alarm and engine shut off), and my dog was in crew mode (alarm only). I used the system for several years, and it worked when I tested. Fortunately, no real emergencies. I will likely install the same OLAS system on my 40 foot cruising sailboat, as I solo there as well. I too recognize the sailing limitations. We all have pictured a perfectly trimmed sailboat sailing away on auto pilot after falling overboard. I have envisioned also wiring the OLAS to the autopilot. Once the autopilot’s power is cut off, the boat would eventually head into or off the wind. This may be pure fantasy. Thanks for this review, as one of my hesitations on going with the OLAS system again was the consideration of what else might be out there. Looks like I’ll go with the OLAS again.

    • Thanks for sharing your experience with the OLAS system. My review should have mentioned a third ACR OLAS system that is even more affordable. It’s called the ACR OLAS Core, and it’s available online for $178 ( https://www.westmarine.com/acr-electronics-olas-core—base-station-for-olas-transmitters-and-man-overboard-mob-alarm-system-20282109.html ). It costs less because it does NOT include a switch and does NOT integrate with an engine cut-off switch. It’s strictly the core MOB system.

      I had not thought of cutting off the power to the autopilot instead of the engine. That might work (eventually) under sail, but if you WERE under power, the boat would presumably be doing great big circles. For my boat, which has a manual fuel cut-off, I’d have to find and install an electric cut-off switch and then have the system cut out both the engine and the autopilot. I’m going to wait and see what manufacturers come up with.

  2. i installed a fell marine mob+ on my 35′ sailboat with diesel that i singlehand often. the boat also has a garmin reactor autopilot. i did a “hybrid” installation through a couple of relays whereby if i go overboard it both kills the engine and disengages the autopilot. so in the event of mob, the boat is incapacitated whether it’s under power or sail. in spite of the boat being larger than what fell recommends, i’ve had no problems withe range of the system