I recall around 1990 A.D. there was a several day power outage in Woodinville WA. I had a portable Panasonic multiband radio and with only a few feet of antenna wire, it picked up a 1 watt ( INPUT PWR ! ) beacon on the 160 kHz Part 15 license - free band, at about 50+ miles range. Not normally detectable. I imagine being out at sea, you would really have some great DX potential. I maybe should have bought a boat when i moved out here.