I hope to replace the AM/FM/Cassette player in my boat with an AM/FM/Digital media player. When reviewing the owner’s manual prior to purchase I noted that the installation instructions call for two sources of power: one wire to an ignition or accessory circuit and another wire directly from the positive terminal on the battery. These instructions are for installing the player in a car and the wire that would come from the ignition or accessory circuit on a car will come from the switch for the AM/FM radio on the panel board on my boat and will be protected by an in-line fuse. My concern arises from the wire directly from the battery which provides power for the clock, calendar, and, perhaps, memory presets, etc. Specifically, would these loads significantly deplete the battery from which the power is to be drawn? My intuitive sense is not to worry about it; after all, the battery drain is not a problem when installed in a car. Is there any reason to think otherwise? I suppose that this wire should be protected by an in-line fuse located as close to the battery as possible.