Without revealing details of my own system, and having installed a number of security
systems for others, I can offer the following: There is an unwritten truth in the security
industry, There is no absolute security. The best you can do is to make it time consuming and noisy to penetrate a secure area. The consequence of that time and noise
may cause an intruder to consider alternate targets.
With that, remember that bad guys won't generally (but sometimes, will) choose to break in when it's bright and crowded with potential defenders. So, mikereed100 is on top of the first line of defense. There is a class of 12 volt lamps that turn night time into daylight. They are called HID (High Intensity Discharge). If you mount them below the spreaders, they will provide incredible illumination to the decks and area near the boat. You can add a switch next to your bunk, should you hear a "bump" in the night, flip the switch. A second switch can be added which activates your PA hailer horns and, with the addition of the right audio driver, can announce, in multiple languages of choice, that this is not a good place to be at present. The 130 dB siren helps to effectively communicate to the bad guys, and any neighbors within a half-mile radius, that something bad is happening.
The simplest alarm
systems work great on boats. Most alarm systems are 12 volt powered, using storage
batteries for backup should the bad guys (or weather) shut down the grid. Alarm systems have multiple zone protection, meaning that if armed, you can be inside the boat walking about, while exterior places and items can be separately guarded against a midnight intruder. Magnetic switches, pressure switches, passive infrared devices and other units provide a wide variety of options against someone opening a hatch
, trying to remove a dinghy
, even a bicycle or a fishing
Alarm systems don't have to be expensive, just well thought out and well installed. Having lights that automatically turn on around the outside (or on the inside if you are away) keeps the bad guys guessing. I'll post some suggested sources later.