Larry, I saw this posting on the "trawlers and trawlering" list - not sure how to post a reply there. Another option for alarms is Marine Guard (http://www.marineguardsecurity.com/). Homemade systems and adapted automotive systems can work, but they tend not to stand up to the marine environment very well. If you have any questions, feel free to drop me a reply, or check out my blog at http://yachtsecurity.blogspot.com. I am located in Tampa, Florida. Have a Merry Christmas. Don Weiss President, Maritime Vital Asset Protection, LLC _________________________________________________________________ News, entertainment and everything you care about at Live.com. Get it now! http://www.live.com/getstarted.aspx