How can I protect my boat's electronics from theft?

Take removable electronics home, secure fixed equipment from behind the mounting panel, and strengthen the locks controlling access to the boat. Fit an alarm that can notify you with the main battery switch off, and keep photographs and serial numbers for identification and insurance claims.

Check removable equipment

Start at the helm. Check whether the chartplotter lifts out once its two bracket knobs are undone and its cables unplugged. Then look for access to the mounting nuts through an unsecured cockpit locker, instrument pod or removable panel. Expensive equipment has little protection if a thief can reach its fasteners.

• Take home: tablets, handheld GPS units, handheld VHFs, cameras and portable fishfinders.
• Remove when practical: bracket-mounted chartplotters and fishfinder displays, particularly before winter storage.
• Secure in place: flush-mounted displays, fixed VHFs, AIS transceivers and autopilot computers where repeated removal would disturb wiring or seals.

A sun cover protects the screen but offers no meaningful resistance to theft. An obvious cabin drawer gives a display little protection once someone gets aboard. For prolonged absences, taking valuable removable equipment off the premises is the strongest practical measure.

Secure fixed displays

Fit a purpose-made locking bracket if one is available for your exact display and mounting arrangement. Compatibility varies between models, even within Garmin, Raymarine and Lowrance ranges. Check bracket and fastener dimensions before ordering.

For flush-mounted equipment, protect access to the rear fixings. Through-bolted panels with substantial backing washers generally resist removal better than thin panels held by exposed self-tapping screws. Security-head screws can slow casual removal, but they need sound material behind them. Treat them as one layer of protection.

There is no universal tightening torque for instrument mounts. Follow the equipment instructions. Overtightening can crack a plastic bezel or distort its seal. Leave enough access for servicing without dismantling half the helm.

Before altering mounts or wiring, isolate the relevant electrical supply and check for concealed cables and hoses behind the panel. If drilling exposes a cored deck or console, seal the core properly before fitting the hardware.

Allow roughly £20 to £80 for small security fittings and £50 to £150 or more for a dedicated locking mount. Fitting and panel repairs cost extra.