Product type: Specialty safety item for boaters of all kinds. Boaters caught in the fog or rain or snow are required to make periodic sound signals, ("fog signals"), to alert other boats in the area of their location and status. Smaller boats usually do not have automated systems to do this. They must rely on hand operated CO2 air-horn cans, which are expensive and run out in less than one hour of periodic signaling, a duty which is stressful in itself. One morning's fog can use two or more CO2 cans, at $12.99 per can. And once the cans you have are gone you are left without any way to make emergency fog signals. VHF radio can be used to contact other boats of course, but it cannot warn boats moving in the vicinity who have no radio, or, often, have it turned off. This new product provides a neat solution. Many boats have a good, loud stereo system with speakers on deck.Other boaters bring a"boombox" along.All CD players can be set to repeat a single track over and over. The boater simply sets the CD player to repeat the desired signal track and cranks up the volume.NOTE:just having the recorded horn or bells is not enough. One must have the correct number and duration of each, and they must have the correct intervals in between. That is what makes this CD so useful: Horn and bell signals repeat, depending on which is used, every 30 seconds to two minutes, continuously, without further effort and with no expense. Both the sounds and the silent intervals between are included on the tracks of the CD. Twenty official signals are included, from"Under power, making way" to"Aground", to"Sailing (in fog)". The no-refill concept is especially appealing to anyone who has ever run out of Co2 in the fog.