Autotether Wireless Kill Switch — Portable Boat Safety Device

The Autotether is a portable, wireless alternative to traditional hard-wired lanyard kill switches. Instead of a physical cord, it uses a small transmitter and remotely paired immersion sensors to send a radio signal to a receiver that is connected to the boat’s ignition. If a sensor becomes submerged—indicating the skipper or a passenger has gone overboard—the interruption of that signal is designed to shut down the engine, reducing the risk of the vessel continuing to run uncontrolled.

How it works

The system relies on radio communication between a compact transmitter and one or more immersion sensors. Each sensor monitors whether it is dry or submerged; when a sensor is covered by water, the transmitter no longer receives its signal and then communicates this to the receiver wired to the ignition, which activates the kill switch. The transmitter and sensors are powered by two AAA batteries, and one transmitter can handle up to four sensors simultaneously, allowing coverage for multiple positions on the boat or for use by several people.

Key features and benefits

Autotether offers several practical features that make it suitable for many small-boat and inflatable applications:

• No permanent wiring: Because the receiver attaches to the ignition and the sensors are wireless, installation is straightforward and does not require extensive modification of the boat’s electrical system.
• Multiple sensors: A single transmitter working with up to four immersion sensors lets you protect the helm, the passenger area, or other critical positions on board.
• Audible alarm option: In addition to cutting the engine, the system can be configured to trigger a horn or audible alarm so nearby people know there has been an overboard event.
• Anti-theft capability: The unit can also be adapted as a deterrent for theft—particularly useful for small inflatables with portable kicker outboards—by cutting ignition when unauthorized motion or tampering is detected.
• Compatibility: Autotether provides ignition switch clips to fit engines equipped with kill-switch terminals. Manufacturers listed for compatibility include Evinrude, Johnson, Yamaha, Mercury, Honda, Suzuki and SeaDoo.

Installation and use

Installation is designed to be user-friendly and non-invasive. The receiver clips to the engine’s kill-switch terminal, and the immersion sensors are placed on the person, the helm, or other strategic locations. Because there is no complex wiring through the hull or dash, the system can be moved between boats or removed for winter storage with minimal effort. The immersion sensors are intended to be rugged and suitable for marine environments, but like all safety gear they should be checked regularly for proper operation and battery condition.

Pricing and availability

At the time of reporting, the Autotether system with two sensors is listed at $295, and additional sensors are available for $45 each. The system is supplied by Autotether, based in Rocky Hill, Connecticut. Contact information given by the manufacturer includes phone: (888) 593-4181 and the company website listed as www.autotether.com (please consult the manufacturer for the most current product details, pricing and authorized dealers).

Practical considerations

While a wireless kill-switch system like Autotether provides flexibility and ease of installation, boaters should treat it as one part of an overall safety plan. Regularly test the sensors and replace batteries as recommended. Train crew and passengers in man-overboard procedures and ensure that personal flotation devices (PFDs) are worn as appropriate. Consider how sensors are positioned on busy boats to avoid accidental activation and to ensure reliable detection in an overboard situation.

Summary

Autotether offers a modern, portable approach to engine shutoff that removes the need for a tethered lanyard while adding options such as multiple sensors, audible alerts and anti-theft modes. Its no-wiring installation and compatibility with common outboard manufacturers make it a practical choice for many recreational boaters looking to improve onboard safety and convenience. As with any safety device, routine maintenance and familiarization with the system are important to ensure dependable performance when it matters most.

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