Garmin OnBoardMOB system with engine shutdown and plotter integration

Hauke Schmidt

 · 20.10.2025

The transponders of the MOB system can also be used to mark objects
Photo: Garmin Deutschland
Garmin's wireless onboard man-overboard system is connected to the chart plotter. It stores the position of the person overboard and can stop the engine. The system monitors up to eight people or objects.

With OnBoard, Garmin is introducing a new MOB system. It is intended to replace conventional emergency stop lines on motorboats, but can also be used as a man-overboard system on sailing yachts. The compact transmitters recognise when someone goes overboard and report the incident to the chart plotter, which saves the position. If a crew member or the driver goes overboard, the engine is stopped on motorboats, depending on the situation. The system requires a compatible Garmin chart plotter. Up to eight MOB transmitters can be tracked simultaneously.

Flexible carrying options

Onboard consists of the central unit called GOS 10 and up to eight MOB transmitters. The transmitters can be worn in different ways: with a wrist strap, a floatable key fob or a carabiner. The system distinguishes between the skipper and other people on board. If a passenger falls overboard, an alarm is triggered on the chart plotter and a loud acoustic alarm sounds. If, on the other hand, the skipper falls into the water, an engine shutdown is forced in addition to the alarm so that the boat does not continue travelling without a skipper. The battery of a MOB transmitter lasts up to one season with normal use.

Automatic MOB alarm on the chart plotter

The onboard system can be paired and managed with compatible Garmin Echomap and GPSmap chartplotters. The system offers a practical function for temporary activities in the water: temporary deactivation of transmitters allows swimming and excursions without triggering the alarm. The basic system consists of the central unit and a MOB transmitter and costs around 650 euros. Additional transmitters are available for around 170 euros each.

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